Immersion (IMMR) 10-Q 11 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 04, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	IMMR
Entity Registrant Name	IMMERSION CORP
Entity Central Index Key	1,058,811
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		30,367,214

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 119,128	$ 24,622
Short-term investments	19,842	21,916
Accounts and other receivables	2,667	806
Prepaid expenses and other current assets	5,616	736
Total current assets	147,253	48,080
Property and equipment, net	2,903	3,150
Deferred income tax assets	371	401
Other assets	4,808	344
Total assets	155,335	51,975
Current liabilities:
Accounts payable	4,256	6,647
Accrued compensation	2,552	4,133
Other current liabilities	3,296	3,896
Deferred revenue	4,920	4,424
Total current liabilities	15,024	19,100
Long-term deferred revenue	33,665	22,303
Other long-term liabilities	1,374	915
Total liabilities	50,063	42,318
Contingencies (Note 12)
Stockholders’ equity:
Common stock and additional paid-in capital — $0.001 par value; 100,000,000 shares authorized; 37,043,975 and 35,950,518 shares issued, respectively; 30,357,285 and 29,263,828 shares outstanding, respectively	235,438	228,046
Accumulated other comprehensive income	104	99
Accumulated deficit	(83,398)	(171,616)
Treasury stock at cost: 6,686,690 shares	(46,872)	(46,872)
Total stockholders’ equity	105,272	9,657
Total liabilities and stockholders’ equity	$ 155,335	$ 51,975

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common Stock, shares authorized (in shares)	100,000,000	100,000,000
Common Stock, shares issued (in shares)	37,043,975	35,950,518
Common Stock, shares outstanding (in shares)	30,357,285	29,263,828
Treasury Stock, shares (in shares)	6,686,690	6,686,690

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Royalty and license	$ 85,335	$ 9,006
Development, services, and other	81	218
Total revenues	85,416	9,224
Costs and expenses:
Cost of revenues	35	43
Sales and marketing	1,220	3,305
Research and development	2,820	3,196
General and administrative	11,236	15,532
Total costs and expenses	15,311	22,076
Operating income (loss)	70,105	(12,852)
Interest and other income	231	139
Income (loss) before provision for income taxes	70,336	(12,713)
Provision for income taxes	(453)	(152)
Net income (loss)	$ 69,883	$ (12,865)
Basic net loss per share (in dollars per share)	$ 2.35	$ (0.44)
Shares used in calculating basic net income (loss) per share (in shares)	29,700	29,024
Diluted net loss per share (in dollars per share)	$ 2.29	$ (0.44)
Shares used in computation of diluted net income (loss) per share (in shares)	30,566	29,024
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ 5	$ (22)
Total other comprehensive income (loss)	5	(22)
Total comprehensive income (loss)	$ 69,888	$ (12,887)

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows provided by (used in) operating activities:
Net income (loss)	$ 69,883	$ (12,865)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization of property and equipment	227	232
Stock-based compensation	1,222	1,557
Deferred income taxes	(67)	0
Loss on disposal of equipment	26	0
Changes in operating assets and liabilities:
Accounts and other receivables	(1,861)	(527)
Prepaid expenses and other current assets	116	150
Other assets	(4,524)	(55)
Accounts payable	(2,391)	1,000
Accrued compensation and other current liabilities	(2,181)	(1,741)
Deferred revenue	25,197	(2,046)
Other long-term liabilities	422	(22)
Net cash provided by (used in) operating activities	86,203	(14,317)
Cash flows provided by (used in) investing activities:
Purchases of short-term investments	(8,861)	(9,931)
Proceeds from maturities of short-term investments	11,000	10,000
Purchases of property and equipment	(6)	(83)
Net cash provided by (used in) investing activities	2,133	(14)
Cash flows provided by financing activities:
Issuance of common stock under employee stock purchase plan	98	175
Exercise of stock options	6,072	401
Net cash provided by financing activities	6,170	576
Net increase (decrease) in cash and cash equivalents	94,506	(13,755)
Cash and cash equivalents:
Beginning of period	24,622	56,865
End of period	119,128	43,110
Supplemental disclosure of cash flow information
Cash paid for taxes	90	39
Supplemental disclosure of noncash operating, investing, and financing activities
Amounts accrued for property and equipment	0	11
Release of Restricted Stock Units and Awards under company stock plan	$ 1,860	$ 1,768

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Description of Business Immersion Corporation (the “Company”) was incorporated in 1993 in California and reincorporated in Delaware in 1999. The Company focuses on the creation, design, development, and licensing of innovative haptic technologies that allow people to use their sense of touch more fully as they engage with products and experience the digital world around them. The Company has adopted a “hybrid” business model, under which it provides advanced tactile software, related tools, and technical assistance to certain customers; and offers licenses to the Company's patented intellectual property (“IP”) to other customers. Principles of Consolidation and Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of Immersion Corporation and its wholly-owned subsidiaries: Immersion Canada Corporation; Immersion International, LLC; Immersion Medical, Inc.; Immersion Japan K.K.; Immersion Ltd.; Immersion Software Ireland Ltd.; Haptify, Inc.; Immersion (Shanghai) Science & Technology Company, Ltd.; and Immersion Technology International Ltd. All intercompany accounts, transactions, and balances have been eliminated in consolidation. The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all information and footnotes necessary for a complete presentation of the financial position, results of operations, and cash flows, in conformity with GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in the Company’s Annual Report on Form 10-K, for the fiscal year ended December 31, 2017 . In the opinion of management, all adjustments consisting of only normal and recurring items necessary for the fair presentation of the financial position and results of operations for the interim periods presented have been included. The results of operations for the three months ended March 31, 2018 are not necessarily indicative of the results to be expected for the full year. Segment Information The Company develops, licenses, and supports a wide range of software and IP that more fully engage users’ sense of touch as they engage with products and experience the digital world around them. The Company currently focuses on the following target application areas: mobility, automotive, gaming, medical and wearables. The Company’s chief operating decision maker (“CODM”) is the Chief Executive Officer. The CODM allocates resources to and assesses the performance of the Company using information about its financial results as one operating and reporting segment. Revenue Recognition In May 2014, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update (“ASU”) 2014-09 “Revenue from Contracts with Customers (Topic 606)" ("Accounting Standard Codification 606", "ASC 606"), which superseded most prior revenue recognition guidance under ASC Topic 605, "Revenue Recognition" ("ASC 605") including industry-specific guidance. The underlying principle of ASC 606 is that an entity will recognize revenue to depict the transfer of promised goods or services to customers at an amount that the entity expects to be entitled in exchange for those goods or services. The new standard provides a five-step analysis of transactions to determine when and how revenue is recognized, and shall be applied retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption if the modified retrospective transition method is elected. The new standard also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity's contracts with customers. The Company adopted the new revenue standard effective January 1, 2018 using the modified retrospective transition method where the cumulative effect of the initial application is recognized as an adjustment to the opening balance of the accumulated deficit at January 1, 2018, the date of adoption. Therefore, comparative prior periods have not been adjusted and continue to be presented under ASC 605. Refer to Note 2 to the condensed consolidated financial statements for the Company's revised revenue recognition accounting policy and a summary of the impact of adoption of ASC 606. Recent Accounting Pronouncements Adopted In March 2018, the FASB issued ASU2018-05 "Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (SEC Update)", which updates Securities and Exchange Commission (“SEC”) guidance released in December 2017 when the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Additional information regarding the adoption of this ASU and its material impact on the Company's condensed consolidated financial statements is contained in Note 10 to the condensed consolidated financial statements. In May 2017, the FASB issued ASU 2017-09 “Stock Compensation: Scope of Modification Accounting”. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2017. The Company adopted the standard effective January 1, 2018. The adoption of this ASU did not have a material impact on its condensed consolidated financial statements. In December 2016, the FASB issued ASU 2016-19 “Technical Corrections and Improvements”. The amendments in this update affect a wide variety of topics in the Accounting Standards Codification. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2017, and interim periods in the annual period beginning after December 15, 2018. The Company adopted the standard effective January 1, 2018. The adoption of this ASU did not have a material impact on its condensed consolidated financial statements. Not yet adopted In February 2018, the FASB issued ASU 2018-02 "Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income". The amendments in this ASU allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. The guidance is effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing when it will adopt this ASU and its potential impact on the Company’s condensed consolidated financial statements. In February 2016, the FASB issued ASU 2016-02 “Leases: Topic 842” (“ASU 2016-02”), which supersedes the existing guidance for lease accounting in Topic 840, Leases. The FASB issued the ASU to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset for all leases. Lessor accounting remains largely unchanged. This ASU is effective for periods beginning after December 15, 2018, with early adoption permitted. An entity will be required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is currently in the process of evaluating the impact of this standard on its condensed consolidated financial statements, but has not elected to early adopt the standard and would plan to implement the standard on January 1, 2019.

REVENUE RECOGNITION

REVENUE RECOGNITION	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION Revised Revenue Recognition Accounting Policy On January 1, 2018, the Company adopted ASC 606 using the modified retrospective transition method. The new revenue standard has been applied to all contracts that were not completed as of the date of adoption. To the extent that modifications occurred prior to the adoption of ASC 606, the Company has reflected the aggregate impact of any modification when evaluating the impact of the adoption. The Company's revenue is primarily derived from fixed fee license agreements and per-unit royalty agreements, along with less significant revenue earned from development, services and other revenue. The adoption of ASC 606 affected the Company's revenue recognition model for both fixed fee license revenue and per-unit royalty revenue presented on “royalty and license revenue” on the Company’s condensed consolidated statements of operations and comprehensive income (loss). Fixed fee license revenue In applying ASC 606, the Company is required to recognize revenue from a fixed fee license agreement when it has satisfied its performance obligations, which typically occurs upon the transfer of rights to the Company's technology upon the execution of the license agreement. However, in certain contracts, the Company grants a license to its existing patent portfolio at the inception of the license agreement as well as rights to the portfolio as it evolves throughout the contract term. For such arrangements, the Company has concluded that it has two separate performance obligations: • Performance Obligation A: to transfer rights to the Company's patent portfolio as it exists when the contract is executed; • Performance Obligation B: to transfer rights to the Company's patent portfolio as it evolves over the term of the contract, including access to new patent applications that the licensee can benefit from over the term of the contract. Under the Company's previous accounting practices under ASC 605, fixed license fees were generally recognized on a straight-line basis over the contract term. As a result of the adoption of ASC 606, if a fixed fee license agreement contains only Performance Obligation A, the Company will recognize most or all of the revenue from the agreement at the inception of the contract. For fixed fee license agreements that contain both Performance Obligation A and B, the Company will be required to allocate the transaction price based on the standalone price for each of the two performance obligations. The Company has developed a process, and established internal controls around such process, to estimate standalone prices related to Performance Obligation A and B using a number of factors primarily related to the attributes of its patent portfolio. Once the transaction price is allocated, the portion of the transaction price allocable to Performance Obligation A will be recognized in the quarter the license agreement is signed and the customer can benefit from rights provided in the contract, and the portion allocable to Performance Obligation B will be recognized on a straight-line basis over the contract term. For such contracts, a contract liability account will be established and included within "deferred revenue" on the condensed consolidated balance sheet. As the rights and obligations in a contract are interdependent, contract assets and contract liabilities that arise in the same contract have been presented on a net basis. Historically, certain of the Company's license agreements contained fixed fees related to past infringements for which the fixed fees were recognized as revenue or recorded as a deduction to its operating expense in the quarter the license agreement was signed. After the adoption of ASC 606, the Company will recognize revenue from such fixed fees related to past infringements in the same manner in the quarter the license agreement is signed. In the event a significant financing component is determined to exist in any of our agreements, the Company will recognize more or less revenue and corresponding interest expense or income, as appropriate. Per-unit Royalty revenue Under the Company's previous accounting practices under ASC 605, it recognized revenue from per-unit royalty agreements in the period in which the related royalty report was received from its licensees, generally one quarter in arrears from the period in which the underlying sales occurred (i.e. on a "quarter-lag"). ASC 606 requires an entity to record per-unit royalty revenue in the same period in which the licensee’s underlying sales occur. As the Company generally does not receive the per-unit licensee royalty reports for sales during a given quarter within the time frame that allows the Company to adequately review the reports and include the actual amounts in its quarterly results for such quarter, the Company accrues the related revenue based on estimates of its licensees’ underlying sales, subject to certain constraints on its ability to estimate such amounts. As a result of accruing per-unit royalty revenue for the quarter based on such estimates, adjustments will be required in the following quarter to true up revenue to the actual amounts reported by its licensees. For the three months ended March 31, 2018 , the Company had no true-ups from the estimates made on January 1, 2018 which would require presentation herein. Certain of the Company's per-unit royalty agreements contains a minimum royalty provision which sets forth minimum amounts to be received by the Company during the contract term. Per the Company's previous accounting policy under ASC 605, such minimum royalties were recognized as revenue at the end of each reporting period (usually a calendar year) if the actual royalties reported by the customer for that reporting period were below the minimum threshold set forth in the contract. Under ASC 606, minimum royalties are considered a fixed transaction price to which the Company will have an unconditional right once all other performance obligations, if any, are satisfied. Therefore, the Company recognizes all minimum royalties as revenue at the inception of the license agreement, or in the period in which all remaining revenue recognition criteria have been met. The Company will establish contract assets for the unbilled minimum royalties on a contract basis. Such contract asset balance will be reduced by the actual royalties reported by the licensee during the contract term until fully utilized, after which point any excess per-unit royalties reported will be recognized as revenue. As the rights and obligations in a contract are interdependent, contract assets and contract liabilities that arise in the same contract have been presented on a net basis. Development, services, and other revenue With little change from its previous accounting practices related to development, service and other revenue, the Company will continue to recognize revenue from this stream when it has satisfied service obligations. Consistent with the Company’s previous accounting practices under ASC 605, the performance obligation related to its development, service and other revenue is satisfied over a period of time, and such revenue is recognized evenly over the period of performance obligation, which is generally consistent with the contractual term. Adjustments upon Adoption of ASC 606 The following table summarizes adjustments related to the Company's adoption of ASC 606. (in thousands) Balance at December 31, 2017 as Reported under ASC 605 Adjustment for Fixed Fee License Revenue * Elimination of Quarter-Lag Per-Unit Royalties Total Adjustments upon Adoption of ASC 606 Balance at January 1, 2018 (ASC 606) Prepaid expenses and other current assets $ 736 $ 4,996 $ 4,996 $ 5,732 Deferred revenue - current (4,424 ) 1,766 1,766 (2,658 ) Long-term deferred revenue (22,303 ) 11,573 11,573 (10,730 ) Accumulated deficit 171,616 (13,339 ) (4,996 ) (18,335 ) 153,281 * Adjustment for fixed fee license revenue includes both the recognition of Performance Obligation A upon the adoption of ASC 606, which had previously been deferred under ASC 605, and the change in the transaction price allocated to Performance Obligation B and consequently the revenue recognized as of January 1, 2018. Disaggregated Revenue The following table presents the disaggregation of the Company's revenue for the three months ended March 31, 2018 under ASC 606. Revenues for the three months ended March 31, 2017 are presented in accordance with ASC 605. (in thousands) Three Months Ended March 31, 2018 2017 Increase (Decrease) Fixed fee license revenue 75,756 2,510 73,246 2,918 % Per-Unit royalty revenue 9,579 6,496 3,083 47 % Total royalty and license revenue 85,335 9,006 76,329 848 % Development, services, and other revenue 81 218 (137 ) (63 )% Total revenues 85,416 9,224 76,192 826 % For the three months ended March 31, 2018 , the Company recognized $487,000 as revenue that had been included in deferred revenue as of the beginning of the period. As of March 31, 2018, the Company had contract assets of $4.8 million and $4.5 million included within prepaid expenses and other current assets and other non-current assets on the condensed consolidated balance sheet, respectively. During the three months ended March 31, 2018 , there was no impairment of the contract assets. Impact of Adoption of ASC 606 In accordance with the requirements of ASC 606, the disclosure of the impact of adoption on the Company's condensed consolidated statements of operations and comprehensive income (loss) and balance sheet as of and for the three months ended March 31, 2018 is presented below. The Company believes that this additional information is vital during the transition year to allow readers of its financial statements to compare financial results from the preceding financial year given the use of the modified retrospective method of adoption. The adoption of ASC 606 did not affect the Company's reported total amounts of cash flows from operating, investing and financing activities as such separate tables for this separate financial statement have not been provided. Amounts contained in the tables below are in thousands, except per share data. Three Months Ended March 31, 2018 2017 As Reported Adjustments ASC 605 As Reported (ASC 605) Revenues: Fixed fee license revenue $ 75,756 $ (72,341 ) $ 3,415 $ 2,510 Per-unit royalty revenue 9,579 (4,351 ) 5,228 6,496 Total royalty and license revenue 85,335 (76,692 ) 8,643 9,006 Development, services, and other revenue 81 — 81 218 Total revenues $ 85,416 $ (76,692 ) $ 8,724 $ 9,224 Operating expenses 15,311 — 15,311 22,076 Operating income (loss) 70,105 (76,692 ) (6,587 ) (12,852 ) Interest and other income 231 — 231 139 Income (loss) before provision for income taxes 70,336 (76,692 ) (6,356 ) (12,713 ) Income tax provision (453 ) — (453 ) (152 ) Net income (loss) $ 69,883 $ (76,692 ) $ (6,809 ) $ (12,865 ) Basic net income (loss) per share $ 2.35 $ (2.58 ) $ (0.23 ) $ (0.44 ) Diluted net income (loss) per share $ 2.29 $ (2.51 ) $ (0.22 ) $ (0.44 ) (in thousands) March 31, 2018 December 31, 2017 As Reported Adjustments ASC 605 As Reported (ASC 605) Prepaid expenses and other current assets 5,616 (4,847 ) 769 736 Other non-current assets 4,808 (4,500 ) 308 344 Deferred revenue - current (4,920 ) (9,521 ) (14,441 ) (4,424 ) Long-term deferred revenue (33,665 ) (76,160 ) (109,825 ) (22,303 ) Accumulated Deficit 83,398 95,027 178,425 171,616 Contracted Revenue Based on contracts signed and payments received as of March 31, 2018, the Company expects to recognize $38.6 million revenue related to Performance Obligation B under its fixed fee license agreements, which is satisfied over time, including $14.3 million over one to three years, and $24.3 million over more than three years, respectively.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS Cash Equivalents and Short-term Investments The financial instruments of the Company measured at fair value on a recurring basis are cash equivalents and short-term investments. The Company’s fixed income available-for-sale securities consist of high quality, investment grade securities. The Company values these securities based on pricing from pricing vendors, who may use quoted prices in active markets for identical assets (Level 1) or inputs other than quoted prices that are observable either directly or indirectly (Level 2) in determining fair value. The types of instruments valued based on quoted market prices in active markets include money market accounts. Such instruments are generally classified within Level 1 of the fair value hierarchy. The types of instruments valued based on quoted prices in markets that are less active, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency are generally classified within Level 2 of the fair value hierarchy and include U.S. treasury securities. The types of instruments valued based on unobservable inputs which reflect the reporting entity’s own assumptions or data that market participants would use in valuing an instrument are generally classified within Level 3 of the fair value hierarchy. The Company had no Level 3 instruments as of March 31, 2018 and December 31, 2017 . Financial instruments measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are classified based on the valuation technique in the table below: March 31, 2018 Fair value measurements using (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Treasury securities $ — $ 19,842 $ — $ 19,842 Money market accounts 56,273 — — 56,273 Total assets at fair value $ 56,273 $ 19,842 $ — $ 76,115 The above table excludes $62.9 million of cash held in banks. December 31, 2017 Fair value measurements using (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Treasury securities $ — $ 21,916 $ — $ 21,916 Money market accounts 1,117 — — 1,117 Total assets at fair value $ 1,117 $ 21,916 $ — $ 23,033 The above table excludes $23.5 million of cash held in banks. U.S. Treasury securities are classified as short-term investments, and money market accounts are classified as cash equivalents on the Company’s condensed consolidated balance sheets. Short-term Investments March 31, 2018 (in thousands) Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Fair Value U.S. Treasury securities $ 19,860 $ — $ (18 ) $ 19,842 Total $ 19,860 $ — $ (18 ) $ 19,842 December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Fair Value U.S. Treasury securities $ 21,939 $ — $ (23 ) $ 21,916 Total $ 21,939 $ — $ (23 ) $ 21,916 The contractual maturities of the short-term investments (classified as available-for-sale securities) on March 31, 2018 and December 31, 2017 were all due within one year. There were no transfers of instruments between Level 1 and 2 during the three months ended March 31, 2018 and the year ended December 31, 2017 .

ACCOUNTS AND OTHER RECEIVABLES

ACCOUNTS AND OTHER RECEIVABLES	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
ACCOUNTS AND OTHER RECEIVABLES	ACCOUNTS AND OTHER RECEIVABLES (in thousands) March 31, 2018 December 31, 2017 Trade accounts receivable $ 2,279 $ 458 Other receivables 388 348 Accounts and other receivables $ 2,667 $ 806

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
PROPERTY AND EQUIPMENT	PROPERTY AND EQUIPMENT (in thousands) March 31, 2018 December 31, 2017 Computer equipment and purchased software $ 3,212 $ 3,206 Machinery and equipment 834 834 Furniture and fixtures 1,146 1,274 Leasehold improvements 3,920 3,920 Total 9,112 9,234 Less accumulated depreciation (6,209 ) (6,084 ) Property and equipment, net $ 2,903 $ 3,150

OTHER CURRENT LIABILITIES

OTHER CURRENT LIABILITIES	3 Months Ended
	Mar. 31, 2018
Other Liabilities, Current [Abstract]
OTHER CURRENT LIABILITIES	OTHER CURRENT LIABILITIES (in thousands) March 31, 2018 December 31, 2017 Accrued legal $ 2,182 $ 2,202 Income taxes payable 118 219 Other current liabilities 996 1,475 Total other current liabilities $ 3,296 $ 3,896

RESTRUCTURING COSTS

RESTRUCTURING COSTS	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
RESTRUCTURING COSTS	RESTRUCTURING COSTS In the fourth quarter of 2017, the Company executed a series of restructuring actions designed to sharpen the Company’s strategic focus and establish a more cost-efficient operating structure. The restructuring activities primarily focused on a reduction of the Company’s global workforce in conjunction with steps taken to: • Significantly reduce the Company’s presence in China and focus its efforts on Mobile OEM licensing in that region; • Cease its Mobile Advertising activities; and • Narrow its focus in the Gaming and VR/AR markets on development efforts to bolster its IP licensing model in these markets The restructuring plan is expected to increase internal efficiencies through the consolidation of certain sites of operation and has resulted in the elimination of approximately 56 positions, or 41% , of the worldwide employee base. For the year ended December 31, 2017, the Company recorded restructuring expenses of $1.6 million . There were no additional restructuring activities during the three months ended March 31, 2018 . The following table summarizes certain minor adjustments to the 2017 restructuring costs that were reflected in the consolidated statements of operations for the three months ended March 31, 2018 . There were no restructuring costs for the three months ended March 31, 2017 . Three Months Ended March 31, 2018 (in thousands) Employee Separation Costs Asset-Related Charges Other Total Restructuring $ (44 ) $ — $ — $ (44 ) Employee separation costs are associated with worldwide headcount reductions. Asset-related charges consist primarily of accelerated depreciation costs related to the closure of one of the Company’s offices in China. Accelerated depreciation costs represent the difference between the depreciation expense as determined using the useful life of the assets prior to the restructuring activities and the revised useful life resulting from the restructuring activities. Other expenses consist primarily of lease termination expenses related to the closure of one of the Company’s offices in China. Substantially all accrued amounts related to the 2017 restructuring activities were paid during the first quarter of 2018. The following table presents a reconciliation of the restructuring reserve recorded within accrued liabilities on the Company’s condensed consolidated balance sheet as of March 31, 2018 : Three Months Ended March 31, 2018 (in thousands) Employee Separation Costs Asset-Related Charges Other Total Balance as of December 31, 2017 $ 1,522 $ — $ 57 $ 1,579 Charges — — — — Adjustments (44 ) — — (44 ) Non-cash activity — — (26 ) (26 ) Cash Payments (1,468 ) — (1,468 ) Balance as of March 31, 2018 10 — 31 41

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION Stock Options and Awards The Company’s equity incentive program is a long-term retention program that is intended to attract, retain, and provide incentives for talented employees, consultants, officers, and directors and to align stockholder and employee interests. The Company may grant time based options, market condition based options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares, performance units, and other stock-based or cash-based awards to employees, officers, directors, and consultants. Under this program, stock options may be granted at prices not less than the fair market value on the date of grant for stock options. These options generally vest over four years and expire from seven to ten years from the date of grant. In addition to time based vesting, market condition based options are subject to a market condition: the closing price of the Company stock must exceed a certain level for a number of trading days within a specified timeframe or the options will be cancelled before the expiration of the options. On June 2, 2017, the Company's stockholders approved an increase to the number of shares reserved for issuance by 3,476,850 shares. Restricted stock generally vests over one year. RSUs generally vest over three years. Awards granted other than an option or stock appreciation right reduce the common stock shares available for grant under the program by 1.75 shares for each share issued. March 31, 2018 Common stock shares available for grant 1,653,597 Standard and market condition stock options outstanding 2,726,207 Restricted stock awards outstanding 44,538 RSU's outstanding 1,210,086 Employee Stock Purchase Plan The Company has an Employee Stock Purchase Plan (“ESPP”). Under the ESPP, eligible employees may purchase common stock through payroll deductions at a purchase price of 85% of the lower of the fair market value of the Company’s common stock at the beginning of the offering period or the purchase date. Participants may not purchase more than 2,000 shares in a six -month offering period or purchase stock having a value greater than $25,000 in any calendar year as measured at the beginning of the offering period. A total of 1,000,000 shares of common stock has been reserved for issuance under the ESPP. As of March 31, 2018 , 711,967 shares had been purchased since the inception of the ESPP in 1999. Under ASC 718-10, the ESPP is considered a compensatory plan and the Company is required to recognize compensation cost related to the fair value of the award purchased under the ESPP. Shares purchased under the ESPP for the three months ended March 31, 2018 are listed below. Shares purchased under the ESPP for the three months ended March 31, 2017 are 27,667 . The intrinsic value listed below is calculated as the difference between the market value on the date of purchase and the purchase price of the shares. Three Months Ended March 31, 2018 Shares purchased under ESPP 13,834 Average price of shares purchased under ESPP $ 7.11 Intrinsic value of shares purchased under ESPP $ 45,000 Summary of Standard Stock Options The following table sets forth the summary of activity with respect to standard stock options granted under the Company’s stock option plans for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 Beginning outstanding balance 3,277,991 Granted 167,500 Exercised (922,842 ) Forfeited (25,103 ) Expired (43,420 ) Ending outstanding balance 2,454,126 Aggregate intrinsic value of options exercised $ 4,726,000 Weighted average fair value of options granted $ 5.48 The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the exercise price of the Company’s common stock for the options that were in-the-money. Information regarding these standard stock options outstanding at March 31, 2018 is summarized below: Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (years) Aggregate Intrinsic Value (in millions) March 31, 2018 Options outstanding 2,454,126 $ 8.69 3.42 $ 8.0 Options vested and expected to vest using estimated forfeiture rates 2,334,242 8.66 3.28 7.7 Options exercisable 1,730,105 $ 8.56 2.33 $ 5.9 Summary of Market Condition Based Stock Options The Company continued to have an outstanding balance of 272,081 market condition based stock options as of both December 31, 2017 and March 31, 2018 . No activity noted in the period presented. Summary of Restricted Stock Units RSU activity for the three months ended March 31, 2018 was as follows: Three Months Ended March 31, 2018 Beginning outstanding balance 508,880 Awarded 912,793 Released (156,781 ) Forfeited (54,806 ) Ending outstanding balance 1,210,086 Weighted average fair value on grant date of RSUs $ 11.84 Total fair value of RSUs released $ 1,860,000 Information regarding RSUs outstanding at March 31, 2018 is summarized below: Number of Shares Weighted Average Remaining Contractual Life (years) Aggregate Intrinsic Value (in millions) March 31, 2018 RSUs outstanding 1,210,086 1.35 $ 14.5 RSUs vested and expected to vest using estimated forfeiture rates 938,701 1.25 $ 11.2 Summary of Restricted Stock Awards Restricted stock award activity for the three months ended March 31, 2018 was as follows: Three Months Ended March 31, 2018 Beginning outstanding balance 44,538 Awarded — Released — Forfeited — Ending outstanding balance 44,538 Weighted average grant date fair value of restricted stock awarded $ — Total fair value of restricted stock awards released — Stock Plan Assumptions The assumptions used to value option grants under the Company’s stock plans were as follows: Three Months Ended March 31, 2018 2017 Standard Stock Options Expected life (in years) 4.4 4.6 Volatility 54 % 56 % Interest rate 2.5 % 1.9 % Dividend yield N/A N/A Three Months Ended March 31, 2018 2017 Market Condition Based Stock Options Expected life (in years) 7.0 7.0 Volatility 59 % 59 % Interest rate 1.6 % 1.6 % Dividend yield N/A N/A Three Months Ended March 31, 2018 2017 Employee Stock Purchase Plan Expected life (in years) 0.5 0.5 Volatility 74 % 50 % Interest rate 1.7 % 0.7 % Dividend yield N/A N/A Compensation Costs Total stock-based compensation recognized in the condensed consolidated statements of operations and comprehensive income (loss) is as follows: (in thousands) Three Months Ended March 31, 2018 2017 Statement of Operations Classifications Sales and marketing $ (67 ) $ 210 Research and development 256 336 General and administrative 1,033 1,011 Total $ 1,222 $ 1,557 As of March 31, 2018 , there was $12.7 million of unrecognized compensation cost, adjusted for estimated forfeitures, related to non-vested stock options, restricted stock awards and RSUs granted to the Company’s employees and directors. This cost will be recognized over an estimated weighted-average period of approximately 2.56 years for standard options, 1.80 years for RSUs, and 0.17 years for restricted stock awards. Total unrecognized compensation cost will be adjusted for future changes in estimated forfeitures.

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
STOCKHOLDERS' EQUITY	STOCKHOLDERS’ EQUITY Accumulated Other Comprehensive Income The changes in accumulated other comprehensive income are included in the table below. Three Months Ended March 31, 2018 (in thousands) Unrealized Gains and Losses on Short-term Investments Foreign Currency Items Total Beginning balance $ (23 ) $ 122 $ 99 Other comprehensive income before reclassifications 5 — 5 Amounts reclassified from accumulated other comprehensive income — — — Net current period other comprehensive income 5 — 5 Ending Balance $ (18 ) $ 122 $ 104 Stock Repurchase Program On November 1, 2007, the Company announced its Board of Directors (the "Board")’ authorized the repurchase of up to $50.0 million of the Company’s common stock (“Stock Repurchase Program”). In addition, on October 22, 2014, the Board authorized another $30.0 million under the share repurchase program. The Company may repurchase its common stock for cash in the open market in accordance with applicable securities laws. The timing and amount of any stock repurchase will depend on share price, corporate and regulatory requirements, economic and market conditions, and other factors. The stock repurchase authorization has no expiration date, does not require the Company to repurchase a specific number of shares, and may be modified, suspended, or discontinued at any time. There were no stock repurchase during the three months ended March 31, 2018 and 2017 . As of March 31, 2018 , the Stock Repurchase Program remains available with approximately $33.4 million that may yet be purchased under the program. Stockholders Right Plan On December 26, 2017, the Board declared a dividend of one right (a “Right”) for each of the Company's issued and outstanding shares of common stock, par value $0.001 per share. The dividend was paid to the stockholders of record at the close of business on January 8, 2018 (the “Record Date”). Each Right entitles the holder to purchase from the Company one one-thousandth of a share of the Company’s Series B Junior Participating Preferred Stock (the “Preferred Stock”) at a price of $30.00 (the “Exercise Price”), subject to certain adjustments and contingently issuable. There were no rights exercised during the three months ended March 31, 2018 and 2017 .

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES Income tax provisions consisted of the following: (in thousands) Three Months Ended March 31, 2018 2017 Income (loss) from continuing operations before provision for income taxes $ 70,336 $ (12,713 ) Provision for income taxes $ (453 ) $ (152 ) Effective tax rate 0.6 % (1.2 )% The provision for income tax for the three months ended March 31, 2018 resulted primarily from estimated foreign taxes included in the calculation of the effective tax rate. The Company continues to carry a full valuation allowance on its federal deferred tax assets. As a result, no provision for U.S. sourced income was included in the calculation, the primary reason for the difference between the statutory tax rate and effective tax rate. The provision for income tax for the three months ended March 31, 2017 resulted primarily from estimated foreign taxes and foreign withholding tax expense. On December 22, 2017, the U.S. Tax Cuts and Jobs Act (the “Tax Act”) was passed into law. The Act reduces the US federal corporate income tax rate from 35% to 21% , requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred and creates new taxes on certain foreign sourced earnings. In addition, the Act introduced the Base Erosion and Anti-Abuse Tax (“BEAT”), which creates a new tax on certain related party payments. During December 2017, the SEC staff issued Staff Accounting Bulletin No. 118 (“SAB 118”), which provided guidance on accounting for the federal tax rate change and other tax effects of the Tax Act. SAB 118 provided a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740, Income Taxes. In accordance with SAB 118, a company must reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 is complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act is incomplete, but the company is able to determine a reasonable estimate, it must record a provisional estimate in its financial statements. If a company cannot determine a provision estimate to be included in the financial statements, it should continue to apply ASC 740 on the basis of the provisions of the tax laws that were in effect immediately before the enactment of the Tax Act. In connection with the Company's adoption of the Tax Act and consideration of SAB 118, the following updates have been made to the Company's income tax provision. In the fourth quarter of 2017, the Company recorded a $12.9 million reduction to deferred tax assets and related valuation allowance in connection with the re-measurement of certain deferred tax assets and liabilities, resulting in no impact to its results of operations. The Company estimated that no current tax expense should be recorded in connection with the transition tax on the mandatory deemed repatriation of foreign earnings, a provisional estimate at December 31, 2017 . There have been no changes as of March 31, 2018 . Additional work is necessary to complete a more detailed analysis of the Company’s deferred tax assets and liabilities and historical foreign earnings as well as potential correlative adjustments. For the Global Intangible Low-Taxed Income (“GILTI”) provisions of the Tax Act, the Company has not yet completed its assessment or elected an accounting policy to either recognize deferred taxes for basis differences expected to reverse as GILTI or to record GILTI as period costs if and when incurred. At March 31, 2018 , because the Company is still evaluating the GILTI provisions and the analysis of future taxable income that is subject to GILTI, the Company has included GILTI related to current-year operations only in its annual effective tax rate calculation and has not provided additional GILTI on deferred items. Additionally, the Company has determined that it is has not met the threshold requirements of the BEAT. The Company has made a reasonable estimate of the effects of the Act as of March 31, 2018 in accordance with guidance in SAB 118. The Company will continue to monitor the estimated impacts as additional guidance is released. Any adjustments recorded to the provisional amounts through fourth quarter 2018 may be included in net income as an adjustment to tax expense. As of March 31, 2018 , the Company had unrecognized tax benefits under ASC 740 “Income Taxes” of approximately $4.3 million and applicable interest of $12,000 . The total amount of unrecognized tax benefits that would affect the Company’s effective tax rate, if recognized, is $556,000 . The Company’s policy is to account for interest and penalties related to uncertain tax positions as a component of income tax provision. We do not expect to have any significant changes to unrecognized tax benefits during the next twelve months. As of March 31, 2018 , the Company had net deferred income tax assets of $371,000 consisting primarily of foreign net operating loss carryforwards, and deferred income tax liabilities of $80,000 . Because the Company had net operating loss and credit carryforwards, there are open statutes of limitations in which federal, state, and foreign taxing authorities may examine the Company’s tax returns for all years from 1998 through the current period. The Company maintains a valuation allowance of $37.6 million against certain of its deferred tax assets, including all federal, state, and certain foreign deferred tax assets as a result of uncertainties regarding the realization of the asset balance due to historical losses, the variability of operating results, and uncertainty regarding near term projected results. In the event that the Company determines the deferred tax assets are realizable based on its assessment of relevant factors, an adjustment to the valuation allowance may increase income in the period such determination is made. The valuation allowance does not impact the Company’s ability to utilize the underlying net operating loss carryforwards.

NET INCOME (LOSS) PER SHARE

NET INCOME (LOSS) PER SHARE	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
NET INCOME (LOSS) PER SHARE	NET INCOME (LOSS) PER SHARE Basic and diluted net income (loss) per share is computed using the weighted average number of common shares outstanding for the period, excluding unvested restricted stock and RSUs. The following is a reconciliation of the numerators and denominators used in computing basic and diluted net loss per share for both continuing and discontinued operations: Three months ended March 31, 2018 2017 (in thousands, except per share amounts) Numerator: Net income (loss) $ 69,883 $ (12,865 ) Denominator: Shares used in computation of basic net income (loss) per share (weighted average common shares outstanding) 29,700 29,024 Dilutive potential common shares: Stock options, ESPP, restricted Stock and RSUs 866 — Shares used in computation of diluted net income (loss) per share 30,566 29,024 Basic net income (loss) per share $ 2.35 $ (0.44 ) Diluted net income (loss) per share $ 2.29 $ (0.44 ) The Company includes the underlying market condition stock options in the calculation of diluted earnings per share if the performance condition has been satisfied as of the end of the reporting period and excludes such options if the performance condition has not been met. For the three months ended March 31, 2018 , standard stock options to purchase approximately 551,000 shares of common stock, with exercise prices greater than the average fair market value of the Company’s stock of $10.14 per share, were not included in the calculation because the effect would have been anti-dilutive. As of March 31, 2017, the Company had securities outstanding that could potentially dilute basic earnings per share in the future, but these were excluded from the computation of diluted net loss per share for the three months ended March 31, 2017, since their effect would have been anti-dilutive. These outstanding securities consisted of the following: March 31, 2017 Standard and market condition stock options outstanding 3,616,995 Restricted stock awards outstanding 77,540 RSUs outstanding 403,935 ESPP 11,889

CONTINGENCIES

CONTINGENCIES	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
CONTINGENCIES	CONTINGENCIES From time to time, the Company receives claims from third parties asserting that the Company’s technologies, or those of its licensees, infringe on the other parties’ IP rights. Management believes that these claims are without merit. Additionally, periodically, the Company is involved in routine legal matters and contractual disputes incidental to its normal operations. In management’s opinion, the resolution of such matters will not have a material adverse effect on the Company’s consolidated financial condition, results of operations, or liquidity. In the normal course of business, the Company provides indemnification of varying scope to customers, most commonly to licensees in connection with licensing arrangements that include our IP, although these provisions can cover additional matters. Historically, costs related to these guarantees have not been significant, and the Company is unable to estimate the maximum potential impact of these guarantees on its future results of operations. On April 28, 2017, Immersion Corporation and Immersion Software Ireland Limited (collectively, “Immersion”) received a letter from Samsung Electronics Co. (“Samsung”) requesting that Immersion reimburse Samsung with respect to withholding tax and penalties imposed on Samsung by the Korean tax authorities following an investigation where the tax authority determined that Samsung failed to withhold taxes on Samsung’s royalty payments to Immersion Software Ireland from 2012 to 2016. On July 12, 2017, Immersion filed an appeal with the Korea Tax Tribunal regarding their findings with respect to the withholding taxes and penalties. On September 29, 2017, Samsung filed an arbitration demand with the International Chamber of Commerce against Immersion demanding that Immersion reimburse Samsung for the imposed tax and penalties that Samsung paid to the Korean tax authorities. Samsung is requesting that Immersion pay Samsung the amount of KRW 7,841,324,165 (approximately $6.3 million ) plus interest from and after May 2, 2017, plus the cost of the arbitration including legal fees. The Company denies liability, and has asked the International Chamber of Commerce to postpone the arbitration until the tax appeal is resolved. The arbitration panel conducted an initial status conference on February 7, 2018. The panel denied our motion and has proposed a procedural schedule with a hearing in July 2018. We filed our Statement of Defense and Counterclaim on April 16, 2018. Immersion believes that there are valid defenses to all of the claims from the Korean tax authorities and that Samsung’s claims are without merit. Immersion intends to vigorously defend against these claims and as a result, Immersion has concluded that the likelihood of a material charge resulting from this claim is remote. In the event Samsung were to prevail in the arbitration in advance of the conclusion of the appeal with the Korea Tax Tribunal, Immersion could be required to make a payment to Samsung even though it would later be reimbursed should Immersion prevail in the appeal. On October 16, 2017, Immersion received a letter from LG Electronics Inc. (“LGE”) requesting that Immersion reimburse LGE with respect to withholding tax imposed on LGE by the Korean tax authorities following an investigation where the tax authority determined that LGE failed to withhold on LGE’s royalty payments to Immersion Software Ireland from 2012 to 2014. On November 3, 2017, Immersion filed an appeal with the Korea Tax Tribunal regarding their findings with respect to the withholding taxes. Immersion believes that there are valid defenses to the claims raised by the Korean tax authorities and that LGE’s claims are without merit. The Company intends to vigorously defend itself against these claims and as a result, has concluded that the likelihood of a material charge resulting from the claim from LGE to be remote.

SIGNIFICANT ACCOUNTING POLICI18

SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Description of Business	Description of Business Immersion Corporation (the “Company”) was incorporated in 1993 in California and reincorporated in Delaware in 1999. The Company focuses on the creation, design, development, and licensing of innovative haptic technologies that allow people to use their sense of touch more fully as they engage with products and experience the digital world around them. The Company has adopted a “hybrid” business model, under which it provides advanced tactile software, related tools, and technical assistance to certain customers; and offers licenses to the Company's patented intellectual property (“IP”) to other customers.
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation The accompanying condensed consolidated financial statements include the accounts of Immersion Corporation and its wholly-owned subsidiaries: Immersion Canada Corporation; Immersion International, LLC; Immersion Medical, Inc.; Immersion Japan K.K.; Immersion Ltd.; Immersion Software Ireland Ltd.; Haptify, Inc.; Immersion (Shanghai) Science & Technology Company, Ltd.; and Immersion Technology International Ltd. All intercompany accounts, transactions, and balances have been eliminated in consolidation. The accompanying condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions for Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all information and footnotes necessary for a complete presentation of the financial position, results of operations, and cash flows, in conformity with GAAP. The accompanying condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements included in the Company’s Annual Report on Form 10-K, for the fiscal year ended December 31, 2017 . In the opinion of management, all adjustments consisting of only normal and recurring items necessary for the fair presentation of the financial position and results of operations for the interim periods presented have been included. The results of operations for the three months ended March 31, 2018 are not necessarily indicative of the results to be expected for the full year.
Segment Information	Segment Information The Company develops, licenses, and supports a wide range of software and IP that more fully engage users’ sense of touch as they engage with products and experience the digital world around them. The Company currently focuses on the following target application areas: mobility, automotive, gaming, medical and wearables. The Company’s chief operating decision maker (“CODM”) is the Chief Executive Officer. The CODM allocates resources to and assesses the performance of the Company using information about its financial results as one operating and reporting segment.
Revenue Recognition	Revenue Recognition In May 2014, the Financial Accounting Standards Board ("FASB") issued an Accounting Standards Update (“ASU”) 2014-09 “Revenue from Contracts with Customers (Topic 606)" ("Accounting Standard Codification 606", "ASC 606"), which superseded most prior revenue recognition guidance under ASC Topic 605, "Revenue Recognition" ("ASC 605") including industry-specific guidance. The underlying principle of ASC 606 is that an entity will recognize revenue to depict the transfer of promised goods or services to customers at an amount that the entity expects to be entitled in exchange for those goods or services. The new standard provides a five-step analysis of transactions to determine when and how revenue is recognized, and shall be applied retrospectively to each period presented or as a cumulative-effect adjustment as of the date of adoption if the modified retrospective transition method is elected. The new standard also requires enhanced disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from an entity's contracts with customers. The Company adopted the new revenue standard effective January 1, 2018 using the modified retrospective transition method where the cumulative effect of the initial application is recognized as an adjustment to the opening balance of the accumulated deficit at January 1, 2018, the date of adoption. Therefore, comparative prior periods have not been adjusted and continue to be presented under ASC 605. Refer to Note 2 to the condensed consolidated financial statements for the Company's revised revenue recognition accounting policy and a summary of the impact of adoption of ASC 606. Revised Revenue Recognition Accounting Policy On January 1, 2018, the Company adopted ASC 606 using the modified retrospective transition method. The new revenue standard has been applied to all contracts that were not completed as of the date of adoption. To the extent that modifications occurred prior to the adoption of ASC 606, the Company has reflected the aggregate impact of any modification when evaluating the impact of the adoption. The Company's revenue is primarily derived from fixed fee license agreements and per-unit royalty agreements, along with less significant revenue earned from development, services and other revenue. The adoption of ASC 606 affected the Company's revenue recognition model for both fixed fee license revenue and per-unit royalty revenue presented on “royalty and license revenue” on the Company’s condensed consolidated statements of operations and comprehensive income (loss). Fixed fee license revenue In applying ASC 606, the Company is required to recognize revenue from a fixed fee license agreement when it has satisfied its performance obligations, which typically occurs upon the transfer of rights to the Company's technology upon the execution of the license agreement. However, in certain contracts, the Company grants a license to its existing patent portfolio at the inception of the license agreement as well as rights to the portfolio as it evolves throughout the contract term. For such arrangements, the Company has concluded that it has two separate performance obligations: • Performance Obligation A: to transfer rights to the Company's patent portfolio as it exists when the contract is executed; • Performance Obligation B: to transfer rights to the Company's patent portfolio as it evolves over the term of the contract, including access to new patent applications that the licensee can benefit from over the term of the contract. Under the Company's previous accounting practices under ASC 605, fixed license fees were generally recognized on a straight-line basis over the contract term. As a result of the adoption of ASC 606, if a fixed fee license agreement contains only Performance Obligation A, the Company will recognize most or all of the revenue from the agreement at the inception of the contract. For fixed fee license agreements that contain both Performance Obligation A and B, the Company will be required to allocate the transaction price based on the standalone price for each of the two performance obligations. The Company has developed a process, and established internal controls around such process, to estimate standalone prices related to Performance Obligation A and B using a number of factors primarily related to the attributes of its patent portfolio. Once the transaction price is allocated, the portion of the transaction price allocable to Performance Obligation A will be recognized in the quarter the license agreement is signed and the customer can benefit from rights provided in the contract, and the portion allocable to Performance Obligation B will be recognized on a straight-line basis over the contract term. For such contracts, a contract liability account will be established and included within "deferred revenue" on the condensed consolidated balance sheet. As the rights and obligations in a contract are interdependent, contract assets and contract liabilities that arise in the same contract have been presented on a net basis. Historically, certain of the Company's license agreements contained fixed fees related to past infringements for which the fixed fees were recognized as revenue or recorded as a deduction to its operating expense in the quarter the license agreement was signed. After the adoption of ASC 606, the Company will recognize revenue from such fixed fees related to past infringements in the same manner in the quarter the license agreement is signed. In the event a significant financing component is determined to exist in any of our agreements, the Company will recognize more or less revenue and corresponding interest expense or income, as appropriate. Per-unit Royalty revenue Under the Company's previous accounting practices under ASC 605, it recognized revenue from per-unit royalty agreements in the period in which the related royalty report was received from its licensees, generally one quarter in arrears from the period in which the underlying sales occurred (i.e. on a "quarter-lag"). ASC 606 requires an entity to record per-unit royalty revenue in the same period in which the licensee’s underlying sales occur. As the Company generally does not receive the per-unit licensee royalty reports for sales during a given quarter within the time frame that allows the Company to adequately review the reports and include the actual amounts in its quarterly results for such quarter, the Company accrues the related revenue based on estimates of its licensees’ underlying sales, subject to certain constraints on its ability to estimate such amounts. As a result of accruing per-unit royalty revenue for the quarter based on such estimates, adjustments will be required in the following quarter to true up revenue to the actual amounts reported by its licensees. For the three months ended March 31, 2018 , the Company had no true-ups from the estimates made on January 1, 2018 which would require presentation herein. Certain of the Company's per-unit royalty agreements contains a minimum royalty provision which sets forth minimum amounts to be received by the Company during the contract term. Per the Company's previous accounting policy under ASC 605, such minimum royalties were recognized as revenue at the end of each reporting period (usually a calendar year) if the actual royalties reported by the customer for that reporting period were below the minimum threshold set forth in the contract. Under ASC 606, minimum royalties are considered a fixed transaction price to which the Company will have an unconditional right once all other performance obligations, if any, are satisfied. Therefore, the Company recognizes all minimum royalties as revenue at the inception of the license agreement, or in the period in which all remaining revenue recognition criteria have been met. The Company will establish contract assets for the unbilled minimum royalties on a contract basis. Such contract asset balance will be reduced by the actual royalties reported by the licensee during the contract term until fully utilized, after which point any excess per-unit royalties reported will be recognized as revenue. As the rights and obligations in a contract are interdependent, contract assets and contract liabilities that arise in the same contract have been presented on a net basis. Development, services, and other revenue With little change from its previous accounting practices related to development, service and other revenue, the Company will continue to recognize revenue from this stream when it has satisfied service obligations. Consistent with the Company’s previous accounting practices under ASC 605, the performance obligation related to its development, service and other revenue is satisfied over a period of time, and such revenue is recognized evenly over the period of performance obligation, which is generally consistent with the contractual term.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adopted In March 2018, the FASB issued ASU2018-05 "Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 (SEC Update)", which updates Securities and Exchange Commission (“SEC”) guidance released in December 2017 when the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Additional information regarding the adoption of this ASU and its material impact on the Company's condensed consolidated financial statements is contained in Note 10 to the condensed consolidated financial statements. In May 2017, the FASB issued ASU 2017-09 “Stock Compensation: Scope of Modification Accounting”. The ASU provides guidance on the types of changes to the terms or conditions of share-based payment awards to which an entity would be required to apply modification accounting under ASC 718. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2017. The Company adopted the standard effective January 1, 2018. The adoption of this ASU did not have a material impact on its condensed consolidated financial statements. In December 2016, the FASB issued ASU 2016-19 “Technical Corrections and Improvements”. The amendments in this update affect a wide variety of topics in the Accounting Standards Codification. For public business entities, the amendments in this update are effective for annual periods beginning after December 15, 2017, and interim periods in the annual period beginning after December 15, 2018. The Company adopted the standard effective January 1, 2018. The adoption of this ASU did not have a material impact on its condensed consolidated financial statements. Not yet adopted In February 2018, the FASB issued ASU 2018-02 "Income Statement—Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income". The amendments in this ASU allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act. The guidance is effective for annual reporting periods beginning after December 15, 2018 and interim periods within those fiscal years, and early adoption is permitted. The Company is currently assessing when it will adopt this ASU and its potential impact on the Company’s condensed consolidated financial statements. In February 2016, the FASB issued ASU 2016-02 “Leases: Topic 842” (“ASU 2016-02”), which supersedes the existing guidance for lease accounting in Topic 840, Leases. The FASB issued the ASU to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. ASU 2016-02 requires lessees to recognize a lease liability and a right-of-use asset for all leases. Lessor accounting remains largely unchanged. This ASU is effective for periods beginning after December 15, 2018, with early adoption permitted. An entity will be required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. The Company is currently in the process of evaluating the impact of this standard on its condensed consolidated financial statements, but has not elected to early adopt the standard and would plan to implement the standard on January 1, 2019.

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Schedule of adjustments and impacts related to adoption of ASC 606	Amounts contained in the tables below are in thousands, except per share data. Three Months Ended March 31, 2018 2017 As Reported Adjustments ASC 605 As Reported (ASC 605) Revenues: Fixed fee license revenue $ 75,756 $ (72,341 ) $ 3,415 $ 2,510 Per-unit royalty revenue 9,579 (4,351 ) 5,228 6,496 Total royalty and license revenue 85,335 (76,692 ) 8,643 9,006 Development, services, and other revenue 81 — 81 218 Total revenues $ 85,416 $ (76,692 ) $ 8,724 $ 9,224 Operating expenses 15,311 — 15,311 22,076 Operating income (loss) 70,105 (76,692 ) (6,587 ) (12,852 ) Interest and other income 231 — 231 139 Income (loss) before provision for income taxes 70,336 (76,692 ) (6,356 ) (12,713 ) Income tax provision (453 ) — (453 ) (152 ) Net income (loss) $ 69,883 $ (76,692 ) $ (6,809 ) $ (12,865 ) Basic net income (loss) per share $ 2.35 $ (2.58 ) $ (0.23 ) $ (0.44 ) Diluted net income (loss) per share $ 2.29 $ (2.51 ) $ (0.22 ) $ (0.44 ) (in thousands) March 31, 2018 December 31, 2017 As Reported Adjustments ASC 605 As Reported (ASC 605) Prepaid expenses and other current assets 5,616 (4,847 ) 769 736 Other non-current assets 4,808 (4,500 ) 308 344 Deferred revenue - current (4,920 ) (9,521 ) (14,441 ) (4,424 ) Long-term deferred revenue (33,665 ) (76,160 ) (109,825 ) (22,303 ) Accumulated Deficit 83,398 95,027 178,425 171,616 The following table summarizes adjustments related to the Company's adoption of ASC 606. (in thousands) Balance at December 31, 2017 as Reported under ASC 605 Adjustment for Fixed Fee License Revenue * Elimination of Quarter-Lag Per-Unit Royalties Total Adjustments upon Adoption of ASC 606 Balance at January 1, 2018 (ASC 606) Prepaid expenses and other current assets $ 736 $ 4,996 $ 4,996 $ 5,732 Deferred revenue - current (4,424 ) 1,766 1,766 (2,658 ) Long-term deferred revenue (22,303 ) 11,573 11,573 (10,730 ) Accumulated deficit 171,616 (13,339 ) (4,996 ) (18,335 ) 153,281 * Adjustment for fixed fee license revenue includes both the recognition of Performance Obligation A upon the adoption of ASC 606, which had previously been deferred under ASC 605, and the change in the transaction price allocated to Performance Obligation B and consequently the revenue recognized as of January 1, 2018.
Disaggregated revenue	The following table presents the disaggregation of the Company's revenue for the three months ended March 31, 2018 under ASC 606. Revenues for the three months ended March 31, 2017 are presented in accordance with ASC 605. (in thousands) Three Months Ended March 31, 2018 2017 Increase (Decrease) Fixed fee license revenue 75,756 2,510 73,246 2,918 % Per-Unit royalty revenue 9,579 6,496 3,083 47 % Total royalty and license revenue 85,335 9,006 76,329 848 % Development, services, and other revenue 81 218 (137 ) (63 )% Total revenues 85,416 9,224 76,192 826 %
Contracted revenue	Based on contracts signed and payments received as of March 31, 2018, the Company expects to recognize $38.6 million revenue related to Performance Obligation B under its fixed fee license agreements, which is satisfied over time, including $14.3 million over one to three years, and $24.3 million over more than three years, respectively.

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of financial instruments measured at fair value on recurring basis	Financial instruments measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are classified based on the valuation technique in the table below: March 31, 2018 Fair value measurements using (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Treasury securities $ — $ 19,842 $ — $ 19,842 Money market accounts 56,273 — — 56,273 Total assets at fair value $ 56,273 $ 19,842 $ — $ 76,115 December 31, 2017 Fair value measurements using (in thousands) Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total Assets: U.S. Treasury securities $ — $ 21,916 $ — $ 21,916 Money market accounts 1,117 — — 1,117 Total assets at fair value $ 1,117 $ 21,916 $ — $ 23,033
Schedule of short-term investments	Short-term Investments March 31, 2018 (in thousands) Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Fair Value U.S. Treasury securities $ 19,860 $ — $ (18 ) $ 19,842 Total $ 19,860 $ — $ (18 ) $ 19,842 December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Fair Value U.S. Treasury securities $ 21,939 $ — $ (23 ) $ 21,916 Total $ 21,939 $ — $ (23 ) $ 21,916

ACCOUNTS AND OTHER RECEIVABLES

ACCOUNTS AND OTHER RECEIVABLES (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Schedule of accounts and other receivables	(in thousands) March 31, 2018 December 31, 2017 Trade accounts receivable $ 2,279 $ 458 Other receivables 388 348 Accounts and other receivables $ 2,667 $ 806

PROPERTY AND EQUIPMENT (Tables)

PROPERTY AND EQUIPMENT (Tables)	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of property and equipment	(in thousands) March 31, 2018 December 31, 2017 Computer equipment and purchased software $ 3,212 $ 3,206 Machinery and equipment 834 834 Furniture and fixtures 1,146 1,274 Leasehold improvements 3,920 3,920 Total 9,112 9,234 Less accumulated depreciation (6,209 ) (6,084 ) Property and equipment, net $ 2,903 $ 3,150

OTHER CURRENT LIABILITIES (Tabl

OTHER CURRENT LIABILITIES (Tables)	3 Months Ended
	Mar. 31, 2018
Other Liabilities, Current [Abstract]
Components of other current liabilities	(in thousands) March 31, 2018 December 31, 2017 Accrued legal $ 2,182 $ 2,202 Income taxes payable 118 219 Other current liabilities 996 1,475 Total other current liabilities $ 3,296 $ 3,896

RESTRUCTURING COSTS (Tables)

RESTRUCTURING COSTS (Tables)	3 Months Ended
	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Schedule of restructuring costs	The following table presents a reconciliation of the restructuring reserve recorded within accrued liabilities on the Company’s condensed consolidated balance sheet as of March 31, 2018 : Three Months Ended March 31, 2018 (in thousands) Employee Separation Costs Asset-Related Charges Other Total Balance as of December 31, 2017 $ 1,522 $ — $ 57 $ 1,579 Charges — — — — Adjustments (44 ) — — (44 ) Non-cash activity — — (26 ) (26 ) Cash Payments (1,468 ) — (1,468 ) Balance as of March 31, 2018 10 — 31 41 017 restructuring costs that were reflected in the consolidated statements of operations for the three months ended March 31, 2018 . There were no restructuring costs for the three months ended March 31, 2017 . Three Months Ended March 31, 2018 (in thousands) Employee Separation Costs Asset-Related Charges Other Total Restructuring $ (44 ) $ — $ — $ (44 )

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of stock options and awards	March 31, 2018 Common stock shares available for grant 1,653,597 Standard and market condition stock options outstanding 2,726,207 Restricted stock awards outstanding 44,538 RSU's outstanding 1,210,086
Schedule of employee stock purchase plan	The intrinsic value listed below is calculated as the difference between the market value on the date of purchase and the purchase price of the shares. Three Months Ended March 31, 2018 Shares purchased under ESPP 13,834 Average price of shares purchased under ESPP $ 7.11 Intrinsic value of shares purchased under ESPP $ 45,000
Schedule of standard and market-based stock options activity	The following table sets forth the summary of activity with respect to standard stock options granted under the Company’s stock option plans for the three months ended March 31, 2018 : Three Months Ended March 31, 2018 Beginning outstanding balance 3,277,991 Granted 167,500 Exercised (922,842 ) Forfeited (25,103 ) Expired (43,420 ) Ending outstanding balance 2,454,126 Aggregate intrinsic value of options exercised $ 4,726,000 Weighted average fair value of options granted $ 5.48
Schedule of information regarding standard and market condition based stock options outstanding	Information regarding these standard stock options outstanding at March 31, 2018 is summarized below: Number of Shares Weighted Average Exercise Price Weighted Average Remaining Contractual Life (years) Aggregate Intrinsic Value (in millions) March 31, 2018 Options outstanding 2,454,126 $ 8.69 3.42 $ 8.0 Options vested and expected to vest using estimated forfeiture rates 2,334,242 8.66 3.28 7.7 Options exercisable 1,730,105 $ 8.56 2.33 $ 5.9
Schedule of restricted stock units activity	RSU activity for the three months ended March 31, 2018 was as follows: Three Months Ended March 31, 2018 Beginning outstanding balance 508,880 Awarded 912,793 Released (156,781 ) Forfeited (54,806 ) Ending outstanding balance 1,210,086 Weighted average fair value on grant date of RSUs $ 11.84 Total fair value of RSUs released $ 1,860,000
Schedule of information regarding restricted stock units outstanding	Information regarding RSUs outstanding at March 31, 2018 is summarized below: Number of Shares Weighted Average Remaining Contractual Life (years) Aggregate Intrinsic Value (in millions) March 31, 2018 RSUs outstanding 1,210,086 1.35 $ 14.5 RSUs vested and expected to vest using estimated forfeiture rates 938,701 1.25 $ 11.2
Schedule of restricted stock awards activity	Restricted stock award activity for the three months ended March 31, 2018 was as follows: Three Months Ended March 31, 2018 Beginning outstanding balance 44,538 Awarded — Released — Forfeited — Ending outstanding balance 44,538 Weighted average grant date fair value of restricted stock awarded $ — Total fair value of restricted stock awards released —
Schedule of stock options, market condition based stock options and employee stock purchase plan, valuation assumptions	The assumptions used to value option grants under the Company’s stock plans were as follows: Three Months Ended March 31, 2018 2017 Standard Stock Options Expected life (in years) 4.4 4.6 Volatility 54 % 56 % Interest rate 2.5 % 1.9 % Dividend yield N/A N/A Three Months Ended March 31, 2018 2017 Market Condition Based Stock Options Expected life (in years) 7.0 7.0 Volatility 59 % 59 % Interest rate 1.6 % 1.6 % Dividend yield N/A N/A Three Months Ended March 31, 2018 2017 Employee Stock Purchase Plan Expected life (in years) 0.5 0.5 Volatility 74 % 50 % Interest rate 1.7 % 0.7 % Dividend yield N/A N/A
Schedule of stock-based compensation	Total stock-based compensation recognized in the condensed consolidated statements of operations and comprehensive income (loss) is as follows: (in thousands) Three Months Ended March 31, 2018 2017 Statement of Operations Classifications Sales and marketing $ (67 ) $ 210 Research and development 256 336 General and administrative 1,033 1,011 Total $ 1,222 $ 1,557

STOCKHOLDERS' EQUITY (Tables)

STOCKHOLDERS' EQUITY (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Changes in accumulated other comprehensive income	The changes in accumulated other comprehensive income are included in the table below. Three Months Ended March 31, 2018 (in thousands) Unrealized Gains and Losses on Short-term Investments Foreign Currency Items Total Beginning balance $ (23 ) $ 122 $ 99 Other comprehensive income before reclassifications 5 — 5 Amounts reclassified from accumulated other comprehensive income — — — Net current period other comprehensive income 5 — 5 Ending Balance $ (18 ) $ 122 $ 104

INCOME TAXES (Tables)

INCOME TAXES (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of income tax provisions	Income tax provisions consisted of the following: (in thousands) Three Months Ended March 31, 2018 2017 Income (loss) from continuing operations before provision for income taxes $ 70,336 $ (12,713 ) Provision for income taxes $ (453 ) $ (152 ) Effective tax rate 0.6 % (1.2 )%

NET INCOME (LOSS) PER SHARE (Ta

NET INCOME (LOSS) PER SHARE (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Reconciliation used in Computing Basic and Diluted Net Income (Loss) per Share	The following is a reconciliation of the numerators and denominators used in computing basic and diluted net loss per share for both continuing and discontinued operations: Three months ended March 31, 2018 2017 (in thousands, except per share amounts) Numerator: Net income (loss) $ 69,883 $ (12,865 ) Denominator: Shares used in computation of basic net income (loss) per share (weighted average common shares outstanding) 29,700 29,024 Dilutive potential common shares: Stock options, ESPP, restricted Stock and RSUs 866 — Shares used in computation of diluted net income (loss) per share 30,566 29,024 Basic net income (loss) per share $ 2.35 $ (0.44 ) Diluted net income (loss) per share $ 2.29 $ (0.44 )
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	These outstanding securities consisted of the following: March 31, 2017 Standard and market condition stock options outstanding 3,616,995 Restricted stock awards outstanding 77,540 RSUs outstanding 403,935 ESPP 11,889

SIGNIFICANT ACCOUNTING POLICI29

SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Detail)	3 Months Ended
	Mar. 31, 2018Segment
Accounting Policies [Abstract]
Number of reporting segments	1
Number of operating segments	1

REVENUE RECOGNITION - Adjustmen

REVENUE RECOGNITION - Adjustments Upon Adoption of ASC 606 (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	$ 5,616	$ 5,732	$ 736
Deferred revenue	(4,920)	(2,658)	(4,424)
Long-term deferred revenue	(33,665)	(10,730)	(22,303)
Accumulated deficit	83,398	153,281	171,616
Calculated under revenue guidance in effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	769		736
Deferred revenue	(14,441)		(4,424)
Long-term deferred revenue	(109,825)		(22,303)
Accumulated deficit	178,425		$ 171,616
Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets	(4,847)	4,996
Deferred revenue	(9,521)	1,766
Long-term deferred revenue	(76,160)	11,573
Accumulated deficit	$ 95,027	(18,335)
Adjustment for Fixed Fee License Revenue | Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue		1,766
Long-term deferred revenue		11,573
Accumulated deficit		(13,339)
Elimination of Quarter-Lag Per-Unit Royalties | Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid expenses and other current assets		4,996
Accumulated deficit		$ (4,996)

REVENUE RECOGNITION - Disaggreg

REVENUE RECOGNITION - Disaggregated Revenue (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 85,416,000	$ 9,224,000
Revenue, increase (decrease)			$ 76,192,000
Revenue, increase (decrease), percent			826.00%
Revenue, revenue recognized	487,000
Contract with customer, asset, current	4,800,000		$ 4,800,000
Contract with customer, asset, noncurrent	4,500,000		4,500,000
Contract assets, impairment	0
Fixed fee license revenue
Disaggregation of Revenue [Line Items]
Revenue	75,756,000	2,510,000
Revenue, increase (decrease)			$ 73,246,000
Revenue, increase (decrease), percent			2918.00%
Per-unit royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	9,579,000	6,496,000
Revenue, increase (decrease)			$ 3,083,000
Revenue, increase (decrease), percent			47.00%
Total royalty and license revenue
Disaggregation of Revenue [Line Items]
Revenue	85,335,000	9,006,000
Revenue, increase (decrease)			$ 76,329,000
Revenue, increase (decrease), percent			848.00%
Development, services, and other revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 81,000	$ 218,000
Revenue, increase (decrease)			$ (137,000)
Revenue, increase (decrease), percent			(63.00%)

REVENUE RECOGNITION - Impact of

REVENUE RECOGNITION - Impact of Adoption of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Revenues:
Royalty and license	$ 85,335	$ 9,006
Development, services, and other	81	218
Total revenues	85,416	9,224
Operating Expenses	15,311
Operating income (loss)	70,105	(12,852)
Interest and other income	231	139
Income (loss) before provision for income taxes	70,336	(12,713)
Provision for income taxes	(453)	(152)
Net income (loss)	$ 69,883	$ (12,865)
Basic net loss per share (in dollars per share)	$ 2.35	$ (0.44)
Diluted net loss per share (in dollars per share)	$ 2.29	$ (0.44)
Balance Sheets
Prepaid expenses and other current assets	$ 5,616		$ 5,732	$ 736
Other assets	4,808			344
Deferred revenue - current	(4,920)		(2,658)	(4,424)
Long-term deferred revenue	(33,665)		(10,730)	(22,303)
Accumulated deficit	83,398		153,281	171,616
Fixed fee license revenue
Revenues:
Royalty and license	75,756
Per-unit royalty revenue
Revenues:
Royalty and license	9,579
Calculated under revenue guidance in effect before Topic 606
Revenues:
Royalty and license	8,643	$ 9,006
Development, services, and other	81	218
Total revenues	8,724	9,224
Operating Expenses	15,311	22,076
Operating income (loss)	(6,587)	(12,852)
Interest and other income	231	139
Income (loss) before provision for income taxes	(6,356)	(12,713)
Provision for income taxes	(453)	(152)
Net income (loss)	$ (6,809)	$ (12,865)
Basic net loss per share (in dollars per share)	$ (0.23)	$ (0.44)
Diluted net loss per share (in dollars per share)	$ (0.22)	$ (0.44)
Balance Sheets
Prepaid expenses and other current assets	$ 769			736
Other assets	308			344
Deferred revenue - current	(14,441)			(4,424)
Long-term deferred revenue	(109,825)			(22,303)
Accumulated deficit	178,425			$ 171,616
Calculated under revenue guidance in effect before Topic 606 | Fixed fee license revenue
Revenues:
Royalty and license	3,415	$ 2,510
Calculated under revenue guidance in effect before Topic 606 | Per-unit royalty revenue
Revenues:
Royalty and license	5,228	$ 6,496
Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606
Revenues:
Royalty and license	(76,692)
Development, services, and other	0
Total revenues	(76,692)
Operating Expenses	0
Operating income (loss)	(76,692)
Interest and other income	0
Income (loss) before provision for income taxes	(76,692)
Provision for income taxes	0
Net income (loss)	$ (76,692)
Basic net loss per share (in dollars per share)	$ (2.58)
Diluted net loss per share (in dollars per share)	$ (2.51)
Balance Sheets
Prepaid expenses and other current assets	$ (4,847)		4,996
Other assets	(4,500)
Deferred revenue - current	(9,521)		1,766
Long-term deferred revenue	(76,160)		11,573
Accumulated deficit	95,027		(18,335)
Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606 | Fixed fee license revenue
Revenues:
Royalty and license	(72,341)
Balance Sheets
Deferred revenue - current			1,766
Long-term deferred revenue			11,573
Accumulated deficit			(13,339)
Accounting Standards Update 2014-09 | Difference between revenue guidance in effect before and after Topic 606 | Per-unit royalty revenue
Revenues:
Royalty and license	$ (4,351)
Balance Sheets
Prepaid expenses and other current assets			4,996
Accumulated deficit			$ (4,996)

REVENUE RECOGNITION - Contracte

REVENUE RECOGNITION - Contracted Revenue (Details) $ in Millions	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 14.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-31
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	24.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation	$ 38.6

FAIR VALUE MEASUREMENTS - SCHED

FAIR VALUE MEASUREMENTS - SCHEDULE OF FINANCIAL INSTRUMENTS MEASURED AT FAIR VALUE ON RECURRING BASIS (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 76,115	$ 23,033
Short-term investments | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	19,842	21,916
Cash and cash equivalents | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	56,273	1,117
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	56,273	1,117
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	56,273	1,117
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	19,842	21,916
Significant Other Observable Inputs (Level 2) | Short-term investments | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	19,842	21,916
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Significant Unobservable Inputs (Level 3) | Short-term investments | U.S. Treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	0	0
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents | Money market accounts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets at fair value	$ 0	$ 0

FAIR VALUE MEASUREMENTS - SCH35

FAIR VALUE MEASUREMENTS - SCHEDULE OF SHORT-TERM INVESTMENTS (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, amortized cost	$ 19,860	$ 21,939
Short-term investments, gross unrealized holding gains	0	0
Short-term investments, gross unrealized holding losses	(18)	(23)
Short-term investments, fair value	19,842	21,916
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Short-term investments, amortized cost	19,860	21,939
Short-term investments, gross unrealized holding gains	0	0
Short-term investments, gross unrealized holding losses	(18)	(23)
Short-term investments, fair value	$ 19,842	$ 21,916

FAIR VALUE MEASUREMENTS - ADDIT

FAIR VALUE MEASUREMENTS - ADDITIONAL INFORMATION (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Cash held in banks	$ 62,900,000	$ 23,500,000
Period for contractual maturities of the Company's available-for-sale securities	1 year	1 year
Fair value assets, Level 1 to Level 2	$ 0	$ 0
Fair value assets, Level 2 to Level 1	0	0
Fair value liabilities, Level 1 to Level 2	0	0
Fair value liabilities, Level 2 to Level 1	$ 0	$ 0

ACCOUNTS AND OTHER RECEIVABLE37

ACCOUNTS AND OTHER RECEIVABLES - SCHEDULE OF ACCOUNTS AND OTHER RECEIVABLES (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Trade accounts receivable	$ 2,279	$ 458
Other receivables	388	348
Accounts and other receivables	2,667	806
Allowance for doubtful accounts	$ 0	$ 0

PROPERTY AND EQUIPMENT - SCHEDU

PROPERTY AND EQUIPMENT - SCHEDULE OF PROPERTY AND EQUIPMENT (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, total	$ 9,112	$ 9,234
Less accumulated depreciation	(6,209)	(6,084)
Property and equipment, net	2,903	3,150
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, total	3,212	3,206
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, total	834	834
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, total	1,146	1,274
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, total	$ 3,920	$ 3,920

OTHER CURRENT LIABILITIES (Deta

OTHER CURRENT LIABILITIES (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Liabilities, Current [Abstract]
Accrued legal	$ 2,182	$ 2,202
Income taxes payable	118	219
Other current liabilities	996	1,475
Total other current liabilities	$ 3,296	$ 3,896

RESTRUCTURING COSTS (Details)

RESTRUCTURING COSTS (Details) - 2017 Strategic Restructuring Plan	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)position	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges, number of position eliminated | position	56
Restructuring charges, percentage of position eliminated	41.00%
Charges | $	$ 0	$ 0	$ 1,600,000

RESTRUCTURING COSTS - Restructu

RESTRUCTURING COSTS - Restructuring Costs (Details) - 2017 Strategic Restructuring Plan $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring adjustment	$ (44)
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Restructuring adjustment	(44)
Asset-Related Charges
Restructuring Cost and Reserve [Line Items]
Restructuring adjustment	0
Other
Restructuring Cost and Reserve [Line Items]
Restructuring adjustment	$ 0

RESTRUCTURING COSTS - Restruc42

RESTRUCTURING COSTS - Restructuring Accrual (Details) - 2017 Strategic Restructuring Plan - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Liability beginning of period	$ 1,579,000
Charges	0	$ 0	$ (1,600,000)
Restructuring adjustment	(44,000)
Non-cash activity	(26,000)
Cash Payments	(1,468,000)
Liability end of period	41,000		1,579,000
Employee Separation Costs
Restructuring Reserve [Roll Forward]
Liability beginning of period	1,522,000
Charges	0
Restructuring adjustment	(44,000)
Non-cash activity	0
Cash Payments	(1,468,000)
Liability end of period	10,000		1,522,000
Asset-Related Charges
Restructuring Reserve [Roll Forward]
Liability beginning of period	0
Charges	0
Restructuring adjustment	0
Non-cash activity	0
Cash Payments	0
Liability end of period	0		0
Other
Restructuring Reserve [Roll Forward]
Liability beginning of period	57,000
Charges	0
Restructuring adjustment	0
Non-cash activity	(26,000)
Cash Payments
Liability end of period	$ 31,000		$ 57,000

STOCK-BASED COMPENSATION - SCHE

STOCK-BASED COMPENSATION - SCHEDULE OF STOCK OPTIONS AND AWARDS (Detail) - shares	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares available for grant (in shares)	1,653,597
Standard and market condition stock options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Standard and market condition stock options outstanding (in shares)	2,726,207
Restricted stock awards outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock outstanding (in shares)	44,538	44,538
RSUs outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock outstanding (in shares)	1,210,086	508,880

STOCK-BASED COMPENSATION - SC44

STOCK-BASED COMPENSATION - SCHEDULE OF EMPLOYEE STOCK PURCHASE PLAN (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares purchased under ESPP (in shares)	13,834	27,667
Average price of shares purchased under ESPP (in dollars per share)	$ 7.11
Intrinsic value of shares purchased under ESPP	$ 45

STOCK-BASED COMPENSATION - SC45

STOCK-BASED COMPENSATION - SCHEDULE OF STANDARD AND MARKET-BASED STOCK OPTIONS ACTIVITY (Detail) - Standard Stock Options $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Beginning outstanding balance (in shares)	3,277,991
Granted (in shares)	167,500
Exercised (in shares)	(922,842)
Forfeited (in shares)	(25,103)
Expired (in shares)	(43,420)
Ending outstanding balance (in shares)	2,454,126
Aggregate intrinsic value of options exercised | $	$ 4,726,000
Weighted average fair value of options granted (in dollars per share) | $ / shares	$ 5.48

STOCK-BASED COMPENSATION - SC46

STOCK-BASED COMPENSATION - SCHEDULE OF INFORMATION REGARDING STANDARD AND MARKET CONDITION BASED STOCK OPTIONS OUTSTANDING (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Standard Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Common stock options outstanding (in shares)	2,454,126	3,277,991
Options vested and expected to vest using estimated forfeiture rates, number (in shares)	2,334,242
Options exercisable, number (in shares)	1,730,105
Options outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.69
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Exercise Price (in dollars per share)	8.66
Options exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.56
Options outstanding, Weighted Average Remaining Contractual Life (years)	3 years 5 months 1 day
Options vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years)	3 years 3 months 10 days
Options exercisable, weighted average remaining contractual (years)	2 years 3 months 29 days
Options outstanding, aggregate intrinsic value (in dollars)	$ 8
Options vested and expected to vest using estimated forfeiture rates, Aggregate Intrinsic Value (in dollars)	7.7
Options exercisable, aggregate intrinsic value (in dollars)	$ 5.9
Market Condition Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Common stock options outstanding (in shares)	272,081	272,081

STOCK-BASED COMPENSATION - SC47

STOCK-BASED COMPENSATION - SCHEDULE OF RESTRICTED STOCK UNITS ACTIVITY (Detail) - RSUs outstanding - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock outstanding (in shares)	1,210,086	508,880
Awarded (in shares)	912,793
Released (in shares)	(156,781)
Forfeited (in shares)	(54,806)
Ending outstanding balance (in shares)	1,210,086
Weighted average fair value on grant date of RSUs (in dollars per share)	$ 11.84
Total fair value of RSUs released (in dollars)	$ 1,860

STOCK-BASED COMPENSATION - SC48

STOCK-BASED COMPENSATION - SCHEDULE OF INFORMATION REGARDING RESTRICTED STOCK UNITS OUTSTANDING (Detail) - RSUs outstanding - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs outstanding, number (in shares)	1,210,086	508,880
RSUs vested and expected to vest using estimated forfeiture rates, number (in shares)	938,701
RSUs outstanding, weighted average remaining contractual life (years)	1 year 4 months 6 days
RSUs vested and expected to vest using estimated forfeiture rates, Weighted Average Remaining Contractual Life (years)	1 year 3 months
RSUs outstanding, aggregate intrinsic value (in dollars)	$ 14.5
RSUs vested and expected to vest using estimated forfeiture rates, aggregate intrinsic value (in dollars)	$ 11.2

STOCK-BASED COMPENSATION - SC49

STOCK-BASED COMPENSATION - SCHEDULE OF RESTRICTED STOCK AWARDS ACTIVITY (Detail) - Restricted stock awards outstanding $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted stock outstanding (in shares)	44,538
Awarded (in shares)	0
Released (in shares)	0
Forfeited (in shares)	0
Ending outstanding balance (in shares)	44,538
Weighted average fair value on grant date of RSUs (in dollars per share) | $ / shares	$ 0
Total fair value of restricted stock awards released (in dollars) | $	$ 0

STOCK-BASED COMPENSATION - SC50

STOCK-BASED COMPENSATION - SCHEDULE OF STOCK OPTIONS, MARKET CONDITION BASED STOCK OPTIONS AND EMPLOYEE STOCK PURCHASE PLAN VALUATION ASSUMPTIONS (Detail)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	6 months	6 months
Volatility	74.00%	50.00%
Interest rate	1.70%	0.70%
Standard Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	4 years 4 months 24 days	4 years 7 months 6 days
Volatility	54.00%	56.00%
Interest rate	2.50%	1.90%
Market Condition Based Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	7 years	7 years
Volatility	59.00%	59.00%
Interest rate	1.60%	1.60%

STOCK-BASED COMPENSATION - SC51

STOCK-BASED COMPENSATION - SCHEDULE OF STOCK-BASED COMPENSATION (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation, total	$ 1,222	$ 1,557
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation, total	(67)	210
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation, total	256	336
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation, total	$ 1,033	$ 1,011

STOCK-BASED COMPENSATION - ADDI

STOCK-BASED COMPENSATION - ADDITIONAL INFORMATION (Detail) - USD ($)	Jun. 02, 2017	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options for every share issued (in shares)		1.75
Percentage of fair market value on the purchase date		85.00%
Maximum number of shares per employee (in shares)		2,000
Employee stock purchase plan offering period		6 months
Maximum value of shares per employee		$ 25,000
Common stock reserved for issuance (in shares)		1,000,000
Shares purchased by employee since inception of ESPP (in shares)		711,967
Shares purchased under ESPP (in shares)		13,834	27,667
Unrecognized compensation cost		$ 12,700,000
Standard and market condition stock options outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based payment award vesting period (years)		4 years
Shares reserved for issuance (in shares)	3,476,850
Standard and market condition stock options outstanding | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based payment award expiration period (years)		7 years
Standard and market condition stock options outstanding | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based payment award expiration period (years)		10 years
Restricted stock awards outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based payment award vesting period (years)		1 year
Unrecognized compensation cost, recognized over an estimated weighted-average period (years)		2 months 1 day
RSUs outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based payment award vesting period (years)		3 years
Unrecognized compensation cost, recognized over an estimated weighted-average period (years)		1 year 9 months 18 days
Standard Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, recognized over an estimated weighted-average period (years)		2 years 6 months 21 days

STOCKHOLDERS' EQUITY - CHANGES

STOCKHOLDERS' EQUITY - CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance	$ 99
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income before reclassifications	5
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	5
Ending balance	104
Unrealized Gains and Losses on Short-term Investments
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance	(23)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income before reclassifications	5
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	5
Ending balance	(18)
Foreign Currency Items
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Beginning balance	122
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income before reclassifications	0
Amounts reclassified from accumulated other comprehensive income	0
Net current period other comprehensive income	0
Ending balance	$ 122

STOCKHOLDERS' EQUITY - ADDITION

STOCKHOLDERS' EQUITY - ADDITIONAL INFORMATION (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 26, 2017	Oct. 22, 2014	Nov. 01, 2007
Class of Stock [Line Items]
Stock repurchase program, additional authorized amount					$ 30,000,000	$ 50,000,000
Repurchased shares (in shares)	0	0
Repurchased shares, value	$ 0	$ 0
Stock repurchase program, remaining available repurchase amount	$ 33,400,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001	$ 0.001
Rights, exercised (in shares)	0	0
Series B Junior Participating Preferred Stock
Class of Stock [Line Items]
Right, exercise price (in dollars per share)				$ 30

INCOME TAXES - SCHEDULE OF INCO

INCOME TAXES - SCHEDULE OF INCOME TAX PROVISIONS (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income (loss) from continuing operations before provision for income taxes	$ 70,336	$ (12,713)
Provision for income taxes	$ (453)	$ (152)
Effective tax rate	0.60%	(1.20%)

INCOME TAXES - ADDITIONAL INFOR

INCOME TAXES - ADDITIONAL INFORMATION (Detail) - USD ($) $ in Thousands	1 Months Ended
	Dec. 31, 2017	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, provisional income tax expense	$ 12,900
Unrecognized tax benefits		$ 4,300
Unrecognized tax benefits, interest		12
Unrecognized tax benefits that would affect the Company's effective tax rate		556
Deferred income tax assets	$ 401	371
Deferred income tax liabilities		80
Valuation allowance of deferred tax assets		$ 37,600

NET INCOME (LOSS) PER SHARE - B

NET INCOME (LOSS) PER SHARE - BASIC AND DILUTED NET INCOME (LOSS) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income (loss)	$ 69,883	$ (12,865)
Denominator:
Shares used in calculating basic net income (loss) per share (in shares)	29,700	29,024
Stock options, ESPP, Restricted Stock and RSUs (in shares)	866	0
Shares used in computation of diluted net income (loss) per share (in shares)	30,566	29,024
Basic net loss per share (in dollars per share)	$ 2.35	$ (0.44)
Diluted net loss per share (in dollars per share)	$ 2.29	$ (0.44)
Options to purchase shares of common stock (in shares)	551
Average fair value price per share of common stock (in dollars per share)	$ 10.14

NET INCOME (LOSS) PER SHARE - O

NET INCOME (LOSS) PER SHARE - OUTSTANDING SECURITIES (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)	551,000
Standard and market condition stock options outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)		3,616,995
Restricted stock awards outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)		77,540
RSUs outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)		403,935
ESPP
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase shares of common stock (in shares)		11,889

CONTINGENCIES (Details)

CONTINGENCIES (Details) - Sep. 29, 2017 $ in Millions	USD ($)	KRW (₩)
Samsung | Pending litigation | Tax withholdings on royalty payments
Loss Contingencies [Line Items]
Loss contingency, estimate of possible loss	$ 6.3	₩ 7,841,324,165