Control4 (CTRL) 10-Q 2 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 25, 2014
Document and Entity Information	'	'
Entity Registrant Name	'Control4 Corp	'
Entity Central Index Key	'0001259515	'
Document Type	'10-Q	'
Document Period End Date	31-Mar-14	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Non-accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	23,701,332
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$26,885	$84,546
Short-term investments	36,592	'
Accounts receivable, net	15,623	15,064
Inventories	17,120	15,312
Prepaid expenses and other current assets	2,022	1,773
Total current assets	98,242	116,695
Property and equipment, net	3,727	3,943
Long-term investments	22,107	'
Intangible assets, net	830	928
Other assets	1,143	1,120
Total assets	126,049	122,686
Current liabilities:	'	'
Accounts payable	14,395	13,314
Accrued liabilities	5,420	6,821
Deferred revenue	766	644
Current portion of notes payable	1,091	1,138
Total current liabilities	21,672	21,917
Notes payable	1,578	1,828
Other long-term liabilities	450	467
Total liabilities	23,700	24,212
Commitments and contingencies	'	'
Stockholders' equity:	'	'
Common stock, $0.0001 par value; 500,000,000 shares authorized; 22,785,104 and 23,579,068 shares issued and outstanding at December 31, 2013 and March 31, 2014 (unaudited), respectively	2	2
Additional paid-in capital	204,991	200,545
Accumulated deficit	-102,623	-102,084
Accumulated other comprehensive income (loss)	-21	11
Total stockholders' equity	102,349	98,474
Total liabilities and stockholders' equity	$126,049	$122,686

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
CONDENSED CONSOLIDATED BALANCE SHEETS	'	'
Common stock, par value (in dollars per share)	$0.00	$0.00
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	23,579,068	22,785,104
Common stock, shares outstanding	23,579,068	22,785,104

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS	'	'
Revenue	$31,855	$26,571
Cost of revenue	15,619	13,550
Gross margin	16,236	13,021
Operating expenses:	'	'
Research and development	6,775	6,066
Sales and marketing	6,301	5,605
General and administrative	3,688	2,828
Total operating expenses	16,764	14,499
Loss from operations	-528	-1,478
Other income (expense):	'	'
Interest, net	-19	-75
Other income, net	8	26
Total other expense	-11	-49
Loss before income taxes	-539	-1,527
Income tax benefit	0	56
Net loss	($539)	($1,471)
Net loss per common share:	'	'
Basic (in dollars per share)	($0.02)	($0.59)
Diluted (in dollars per share)	($0.02)	($0.59)
Weighted-average number of shares:	'	'
Basic (in shares)	23,117	2,502
Diluted (in shares)	23,117	2,502

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS	'	'
Net loss	($539)	($1,471)
Other comprehensive loss:	'	'
Foreign currency translation adjustment	1	-5
Net unrealized losses on available-for-sale investments	-33	'
Total other comprehensive loss	-32	-5
Comprehensive loss	($571)	($1,476)

CONDENSED_CONSOLIDATED_STATEME2

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Operating activities	'	'
Net loss	($539)	($1,471)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Depreciation expense	608	512
Amortization of intangible assets	98	68
Provision for doubtful accounts	59	70
Stock-based compensation	1,247	838
Warrant liability income	'	-25
Changes in assets and liabilities:	'	'
Accounts receivable	-603	-332
Inventories	-1,783	-94
Prepaid expenses and other current assets	-246	-338
Other assets	-23	-1,595
Accounts payable	1,038	-1,319
Accrued liabilities	-1,408	77
Deferred revenue	122	493
Other long-term liabilities	-17	179
Net cash used in operating activities	-1,447	-2,937
Investing activities	'	'
Purchases of available-for-sale investments	-59,775	'
Proceeds from sales of available-for-sale investments	1,043	'
Purchases of property and equipment	-389	-1,431
Net cash used in investing activities	-59,121	-1,431
Financing activities	'	'
Proceeds from exercise of options for common stock	3,199	37
Proceeds from notes payable	'	435
Repayment of notes payable	-297	-200
Net cash provided by financing activities	2,902	272
Effect of exchange rate changes on cash and cash equivalents	5	-26
Net decrease in cash and cash equivalents	-57,661	-4,122
Cash and cash equivalents at beginning of period	84,546	18,695
Cash and cash equivalents at end of period	26,885	14,573
Supplemental disclosure of cash flow information	'	'
Cash paid for interest	39	63
Cash paid for taxes	$93	$50

Description_of_Business_and_Su

Description of Business and Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2014
Description of Business and Summary of Significant Accounting Policies	'
Description of Business and Summary of Significant Accounting Policies	'
	1. Description of Business and Summary of Significant Accounting Policies
	Control4 Corporation (‘‘Control4’’ or the ‘‘Company’’) is a leading provider of automation and control solutions for the connected home. The Company unlocks the potential of connected devices, making entertainment systems easier to use, homes more comfortable, appliances more energy efficient, and families more secure. The Company was incorporated in the state of Delaware on March 27, 2003.
	Unaudited Interim Financial Statements
	The accompanying condensed consolidated balance sheets and the condensed consolidated statements of operations, comprehensive loss, and cash flows are unaudited. These unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (‘‘GAAP’’) on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments, consisting of only normal recurring adjustments, considered necessary to present fairly the Company’s financial position, results of operations and cash flows. The results of operations for the three months ended March 31, 2014 are not necessarily indicative of the results that may be expected for the year ending December 31, 2014, or any other future interim or annual period.
	These unaudited interim condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on February 21, 2014. The December 31, 2013 consolidated balance sheet included herein was derived from the audited financial statements as of that date.
	Basis of Presentation
	The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in the unaudited condensed consolidated financial statements.
	Segment Reporting
	Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision maker, the Chief Executive Officer, in making decisions regarding resource allocation and accessing performance. To date, the Company has viewed its operations and manages its business as one operating segment.
	Concentrations of Risk
	The Company’s accounts receivable are derived from revenue earned from dealers and distributors primarily located in the United States and Canada. The Company’s sales to dealers and distributors located outside the United States are generally denominated in United States dollars, except for sales to dealers and distributors located in the United Kingdom, which are denominated in pounds sterling. There were no individual account balances greater than 10% of total accounts receivable at December 31, 2013 and March 31, 2014.
	No dealer or distributor accounted for more than 10% of total revenue for the three months ended March 31, 2013 and 2014.
	The Company relies on a limited number of suppliers for its contract manufacturing. A significant disruption in the operations of these manufacturers would impact the production of the Company’s products for a substantial period of time, which could have a material adverse effect on the Company’s business, financial condition and results of operations.
	Geographic Information
	The Company’s revenue includes amounts earned through sales to dealers and distributors located outside of the United States. With the exception of Canada, no single foreign country accounted for more than 10% of total revenue for the three months ended March 31, 2013 and 2014. The following table sets forth revenue from the U.S., Canadian and all other international dealers and distributors combined (in thousands):
		Three Months Ended
		March 31,
		2013			2014
	Revenue-United States	$	17,702		$	21,547
	Revenue-Canada	3,345			3,239
	Revenue-all other international sources	5,524			7,069
	Total revenue	$	26,571		$	31,855
	International revenue (excluding Canada) as a percent of total revenue	21		%	22		%
	Use of Accounting Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates including those related to revenue recognition, sales returns, provisions for doubtful accounts, product warranty, inventory obsolescence, litigation, determination of fair value of stock options, deferred tax asset valuation allowances and income taxes. Actual results may differ from those estimates.
	Product Warranty
	The Company provides its customers a limited product warranty of two years, which requires the Company to repair or replace (at its option) defective products during the warranty period at no cost to the customer. The Company estimates the costs that may be incurred to replace or repair defective products and records a reserve at the time revenue is recognized. Factors that affect the Company’s warranty liability include the number of installed systems, the Company’s historical experience and management’s judgment regarding anticipated rates of product warranty returns, net of refurbished products. The Company assesses the adequacy of its recorded warranty liability each period and makes adjustments to the liability as necessary. Warranty costs accrued includes amounts accrued for products at the time of shipment, adjustments for changes in estimated costs for warranties on products shipped in the period, and changes in estimated costs for warranties on products shipped in prior periods. It is not practicable for the Company to determine the amounts applicable to each of these components.
	The following table presents the changes in the product warranty liability (in thousands):
		Warranty Liability
	Balance at December 31, 2013	$	1,213
	Warranty costs accrued	204
	Warranty claims	(268		)
	Balance at March 31, 2014	$	1,149
	Net Loss Per Share
	Basic net loss per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed using the weighted-average number of common shares outstanding and potentially dilutive common shares outstanding during the period that have a dilutive effect on net income per share. Potentially dilutive common shares result from the assumed exercise of outstanding stock options and the assumed conversion of outstanding convertible preferred stock and warrants using the if-converted method. In a net loss position, diluted net loss per share is computed using only the weighted-average number of common shares outstanding during the period, as any additional common shares would be anti-dilutive.
	The following table presents the reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share (in thousands):
		Three Months Ended
		March 31,
		2013			2014
	Numerator:
	Net loss	$	(1,471	)	$	(539	)
	Denominator:
	Weighted average common stock outstanding for basic net loss per common share	2,502			23,117
	Effect of dilutive securities—stock options, convertible preferred stock, and warrants to purchase common stock and preferred stock	—			—
	Weighted average common shares and dilutive securities outstanding	2,502			23,117
	The following weighted-average common stock equivalents were anti-dilutive and therefore were excluded from the calculation of diluted net loss per share (in thousands):
		Three Months Ended
		March 31,
		2013		2014
	Convertible preferred stock	15,294		—
	Options to purchase common stock	4,629		4,853
	Warrants to purchase common stock	541		—
	Warrants to purchase preferred stock	194		—
	Total	20,658		4,853
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU 2013-11, ‘‘Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists’’ The amended guidance requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Therefore, this new guidance was effective for the Company beginning January 1, 2014. The adoption of this guidance did not have an impact on the Company’s results of operations, financial position, or cash flows as it relates only to financial statement presentation.

Balance_Sheet_Components

Balance Sheet Components	3 Months Ended
	Mar. 31, 2014
Balance Sheet Components	'
Balance Sheet Components	'
	2. Balance Sheet Components
	Inventories consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Finished goods	$	14,061		$	16,043
	Component parts	1,251			1,077
		$	15,312		$	17,120
	Property and equipment, net consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Computer equipment and software	$	4,152		$	4,354
	Manufacturing tooling and test equipment	2,652			2,667
	Furniture and fixtures	2,046			2,097
	Lab and warehouse equipment	2,374			2,485
	Marketing equipment	604			604
	Leasehold improvements	1,450			1,436
		13,278			13,643
	Less: accumulated depreciation	(9,335		)	(9,916		)
		$	3,943		$	3,727
	Intangible assets, net consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Acquired technology	$	1,678		$	1,678
	Less: accumulated amortization	(750		)	(848		)
		$	928		$	830
	Other assets consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Prepaid licensing	$	716		$	695
	Deposits	404			448
		$	1,120		$	1,143
	Accrued liabilities consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Current portion of settlement obligations (see Note 4)	$	907		$	887
	Sales returns and warranty accruals	2,137			2,152
	Compensation accruals	3,233			1,831
	Other accrued liabilities	544			550
		$	6,821		$	5,420

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements	'
Fair Value Measurements	'
	3. Fair Value Measurements
	Assets Measured and Recorded at Fair Value on a Recurring Basis
	The Company’s financial assets that are measured at fair value on a recurring basis consist of money market funds and available-for-sale investments. The following three levels of inputs are used to measure the fair value of financial instruments:
	Level 1: Quoted prices in active markets for identical assets or liabilities.
	Level 2: Observable inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
	Level 3: Unobservable inputs are used when little or no market data is available.
	The Company determines realized gains or losses on the sale of marketable securities on a specific identification method. During the three months ended March 31, 2014, the Company did not record significant realized gains or losses on the sales of available-for-sale investments.  The following tables show the Company’s cash and available-for-sale investments’ adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short- or long-term investments as of December 31, 2013 and March 31, 2014 (in thousands):
		December 31, 2013
		Adjusted		Unrealized		Unrealized			Fair Value		Cash and		Short-term		Long-term
		Cost		Gains		Losses					Cash		Investments		Investments
											Equivalents
	Cash	$	5,533	$	—	$	—		$	—	$	5,533	$	—	$	—
	Level 1:
	Money market funds	79,013		—		—			—		79,013		—		—
	Subtotal	79,013		—		—			—		79,013		—		—
	Total	$	84,546	$	—	$	—		$	—	$	84,546	$	—	$	—
		March 31, 2014
		Adjusted		Unrealized		Unrealized			Fair Value		Cash and		Short-term		Long-term
		Cost		Gains		Losses					Cash		Investments		Investments
											Equivalents
	Cash	$	8,576	$	—	$	—		$	8,576	$	8,576	$	—	$	—
	Level 1:
	Money market funds	15,510		—		—			15,510		15,510		—		—
	Subtotal	15,510		—		—			15,510		15,510		—		—
	Level 2:
	Asset-backed securities	4,466		—		(1		)	4,465		—		—		4,465
	Corporate bonds	37,085		3		(34		)	37,054		—		19,412		17,642
	Commercial paper	19,980		1		(2		)	19,979		2,799		17,180		—
	Subtotal	61,531		4		(37		)	61,498		2,799		36,592		22,107
	Total	$	85,617	$	4	$	(37	)	$	85,584	$	26,885	$	36,592	$	22,107
	As of March 31, 2014, the Company considers the declines in market value of its investment portfolio to be temporary in nature and does not consider any of its investments other-than-temporarily impaired. The Company typically invests in highly-rated securities, and its investment policy generally limits the amount of credit exposure to any one issuer. The policy requires investments generally to be investment grade, with the primary objective of minimizing the potential risk of principal loss. Fair values were determined for each individual security in the investment portfolio. The maturities of the Company’s long-term investments generally range from one to two years.  When evaluating an investment for other-than-temporary impairment the Company reviews factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer and any changes thereto, changes in market interest rates, and the Company’s intent to sell, or whether it is more likely than not it will be required to sell the investment before recovery of the investment’s cost basis. During the three months ended March 31, 2014, the Company did not recognize any significant impairment charges.
	Fair Value of Other Financial Instruments
	The carrying amounts reported in the accompanying consolidated financial statements for cash and cash equivalents, accounts payable and accrued liabilities approximate their fair value because of the short term nature of the accounts. The fair value of the notes payable approximates its carrying value based on the variable nature of interest rates and current market rates available to the Company (see Note 4).  As a result, the balance of the notes payable are categorized within the Level 2 fair value hierarchy.

LongTerm_Obligations

Long-Term Obligations	3 Months Ended
	Mar. 31, 2014
Long-Term Obligations	'
Long-Term Obligations	'
	4. Long-Term Obligations
	Loan and Security Agreement
	In June 2013, the Company entered into an Amended and Restated Loan and Security Agreement with Silicon Valley Bank (the “SVB Agreement”), which consists of a revolving credit facility of $13.0 million (subject to certain borrowing base restrictions) and term borrowings to fund purchases of property and equipment. All borrowings under the SVB Agreement are collateralized by the general assets of the Company. The revolving credit facility has a variable rate of interest of prime (as published in the Wall Street Journal) or LIBOR plus 2.50%, as selected by the Company. The rate was 3.25% at March 31, 2014. In addition, the Company pays an annual commitment fee of $20,000 and a quarterly unused line of credit fee of 0.375% based on the difference between the borrowing commitment of $13.0 million and the then current balance. The SVB Agreement provided for an additional $2.75 million in term borrowings to fund purchase of property and equipment through May 2014, of which $2.0 million was available at March 31, 2014. Term borrowings are payable in 33 equal monthly payments of principal plus interest and bear interest at prime plus 0.50%, which was 3.75% at March 31, 2014.
	Borrowing under the revolving credit facility is subject to certain collateral restrictions relating primarily to the Company’s accounts receivable and inventory levels. As of March 31, 2014, the total borrowing capacity was approximately $13.0 million, and no borrowings were outstanding. The revolving credit facility has a maturity date of May 29, 2015.
	The SVB Agreement contains various restrictive and financial covenants and the Company was in compliance with each of these covenants as of March 31, 2014.
	Settlement Obligation
	The Company has entered into various settlement agreements relating to alleged patent infringements, which included future payments under non-interest bearing, unsecured notes payable. The carrying values of the notes payable have been discounted using an implied interest rate of 3.75% and are included in accrued and other long term liabilities in the accompanying consolidated balance sheets.
	Future annual payments on the settlement obligations as of March 31, 2014 are shown in the table below (in thousands):
	2014	$	920
	2015	20
	2016	20
		960
	Less amount representing interest	(33		)
	Present value of settlement obligations	927
	Less current portion of settlement obligations	(887		)
	Long-term portion of settlement obligations	$	40

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2014
Income Taxes	'
Income Taxes	'
	5. Income Taxes
	In order to determine the quarterly provision for income taxes, the Company considers the estimated annual effective tax rate, which is based on expected annual income and statutory tax rates in the various jurisdictions in which the Company operates. Certain significant or unusual items are separately recognized in the quarter during which they occur and can be a source of variability in the effective tax rates from quarter to quarter.
	Income tax benefit was $56,000 for the three months ended March 31, 2013, and income tax expense was $0 for the three months ended March 31, 2014, or approximately 4% and 0% of loss before income taxes, respectively.  The effective tax rate for the three months ended March 31, 2014 differs from the U.S. federal statutory rate of 34% primarily due to state income taxes, foreign income taxes, U.S. federal alternative minimum tax, incentive stock options, and the domestic valuation allowance offsetting most of the statutory rate.
	At March 31, 2013 and 2014, the Company had a full valuation allowance against the deferred tax assets of its domestic operations as it believes it is more likely than not that these benefits will not be realized. Significant judgment is required in making this assessment, and it is very difficult to predict when, if ever, the assessment may conclude that the remaining portion of the deferred tax assets are realizable.
	The Company files income tax returns in the United States, including various state and local jurisdictions. The Company’s subsidiaries file income tax returns in the United Kingdom, Hong Kong, China and India. The Company is subject to examination in the United States, the United Kingdom, Hong Kong, China, and India as well as various state jurisdictions. As of March 31, 2014, the Company was not under examination by any tax authorities. Tax years beginning in 2010 are subject to examination by tax authorities in the United States, although net operating loss and credit carryforwards from all years are subject to examinations and adjustments for at least three years following the year in which the attributes are used. Tax years beginning in 2011 are subject to examination by the taxing authorities in Hong Kong. Tax years beginning in 2012 are subject to examination by the taxing authorities in the United Kingdom, China, and India.

Equity_Compensation

Equity Compensation	3 Months Ended
	Mar. 31, 2014
Equity Compensation	'
Equity Compensation	'
	6. Equity Compensation
	Stock Options
	In 2003, the Board of Directors adopted the 2003 Equity Incentive Plan (the “2003 Plan”), which provided for the granting of nonqualified and incentive stock options, stock appreciation rights, stock awards and restricted stock. Under the 2003 Plan, the Company was able to grant nonqualified and incentive stock options to directors, employees and non-employees providing services to the Company. On June 11, 2013, the Company’s Board of Directors adopted the 2013 Stock Option and Incentive Plan (the “2013 Plan”), which was subsequently approved by the Company’s stockholders. The 2013 Plan became effective as of the closing of the Company’s initial public offering. To the extent that any awards outstanding under the 2003 Plan are forfeited or lapse unexercised subsequent to August 1, 2013, the shares of common stock subject to such awards will become available for issuance under the 2013 Plan. The 2013 Plan provides for annual increases in the number of reserved shares of up to 5% of the outstanding number of shares of the Company’s Common Stock as of the preceding December 31. On January 1, 2014, the number of reserved shares was increased by 1,139,255 shares in accordance with the provisions of the 2013 Plan.
	A summary of stock option activity for the three months ended March 31, 2014 is presented below:
		Shares		Weighted			Weighted			Weighted
		Subject to		Average			Average			Average
		Options		Grant Date			Exercise			Remaining
		Outstanding		Fair Value			Price			Contractual
										Life (Years)
	Balance at December 31, 2013	4,905,214					$	6.31
	Granted	787,244		$	11.82		20.86
	Exercised	(786,201	)				4.06
	Forfeited	(11,783	)				14.39
	Balance at March 31, 2014	4,894,474					8.96
	Exercisable options at March 31, 2014	2,668,667					5.27			5
	Vested and expected to vest at March 31, 2014	4,672,052					8.65			6.6
	The following table summarizes information about stock options outstanding and exercisable at March 31, 2014:
		Options Outstanding							Options Exercisable
	Range of Exercise Prices	Weighted			Number of		Weighted-		Number of		Weighted-
		Average			Underlying		Average		Underlying		Average
		Exercise			Shares		Remaining		Shares		Remaining
		Price					Contractual				Contractual
							Life (in				Life (in
							years)				years)
	$0.26 - 1.30	$	0.64		63,440		1		63,440		1
	1.35 - 2.60	2.22			299,241		1.8		299,241		1.8
	2.65 - 3.90	3.17			252,213		2.6		252,213		2.6
	3.95 - 5.20	4.87			765,480		3.9		765,480		3.9
	5.25 - 6.50	6.18			1,510,915		7.1		960,056		6.9
	6.55 - 7.80	7.49			108,979		6.3		96,014		6.3
	7.85 - 9.10	8.84			230,734		8.2		101,721		8.2
	9.15 – 22.92	15.89			1,663,472		9.1		130,502		8.7
					4,894,474				2,668,667
	For the stock option awards vested during the three months ended March 31, 2014, the total fair value was $0.9 million.  The following table summarizes the aggregate intrinsic-value of options exercised, exercisable and vested and expected to vest (in thousands):
		For the three months ended
		and as of March 31, 2014
	Options Exercised	$	14,032
	Options Exercisable	42,533
	Options Vested and Expected to Vest	58,783
	The fair value of each option award is estimated on the date of grant using the Black-Scholes option-pricing model with the following assumptions:
		Three Months Ended March 31,
		2013		2014
	Expected volatility	—	%	56 – 60	%
	Expected dividends	—	%	0	%
	Expected terms (in years)	—		3.8 – 6.1
	Risk-free rate	—	%	1.1 – 2.0	%
	Total stock-based compensation expense has been classified as follows in the accompanying statements of operations (in thousands):
		Three Months Ended March 31,
		2013			2014
	Cost of revenue	$	16		$	20
	Research and development	236			478
	Sales and marketing	184			222
	General and administrative	402			527
	Total stock-based compensation expense	$	838		$	1,247
	At March 31, 2014, there was $17.4 million of total unrecognized compensation cost related to non-vested stock option awards that will be recognized over a weighted-average period of 3.3 years.

Related_Party_Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2014
Related Party Transactions	'
Related Party Transactions	'
	7. Related Party Transactions
	The Company has entered into sales agreements with certain of its investors. The following table sets forth revenue from product sales to companies affiliated with these investors (in thousands):
		Three Months Ended
		March 31,
		2013		2014
	Company 1	$	558	$	707
	Company 2	126		161
	Company 3	285		—
	Company 4	119		—
		$	1,088	$	868
	As of December 31, 2013 and March 31, 2014, the Company had accounts receivable from these companies each totaling $0.6 million.  Purchase and payment terms with these related parties are consistent with other non-affiliated companies.

Commitments_and_Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies	'
Commitments and Contingencies	'
	8. Commitments and Contingencies
	Operating Leases
	The Company leases office and warehouse space under operating leases that expire between 2014 and 2018. The terms of the leases include periods of free rent, options for the Company to extend the leases (three to five years) and increasing rental rates over time. The Company recognizes rental expense under these operating leases on a straight line basis over the lives of the leases and has accrued for rental expense recorded but not paid.
	Rental expense was approximately $0.3 million for each of the three months ended March 31, 2013 and 2014.
	Future minimum rental payments required under non-cancelable operating leases with initial or remaining terms in excess of one year consist of the following as of March 31, 2014 (in thousands):
	2014	$	1,234
	2015	1,665
	2016	1,553
	2017	1,332
	2018	722
	Thereafter	—
		$	6,506
	Purchase Commitments
	The Company had non-cancellable purchase commitments for the purchase of inventory, which extend through September 2014 totaling approximately $20.3 million at March 31, 2014.
	Indemnification
	The Company has agreed to indemnify its officers and directors for certain events or occurrences, while the officer or director is or was serving at the Company’s request in such capacity. The maximum amount of potential future indemnification is unlimited; however, the Company has a director and officer insurance policy that provides corporate reimbursement coverage that limits its exposure and enables it to recover a portion of any future amounts paid. The Company is unable to reasonably estimate the maximum amount that could be payable under these arrangements since these obligations are not capped but are conditional to the unique facts and circumstances involved. Accordingly, the Company has no liabilities recorded for these agreements as of March 31, 2014.
	Employment Agreements
	The Company has signed employment agreements with certain executive officers who are entitled to receive certain benefits if their employment is terminated by the Company, including severance payments, accelerated vesting of stock options and continuation of certain insurance benefits.
	Legal Matters
	The Company is subject to various lawsuits and other claims that arise from time to time in the ordinary course of business. These actions may be based on alleged patent infringement or other matters. The Company intends to defend itself vigorously against any such actions. The Company establishes reserves for specific liabilities in connection with legal actions that it deems to be probable and estimable.
	In management’s opinion, the Company is not currently involved in any legal proceedings other than specifically identified below, that individually or in the aggregate, could have a material effect on the Company’s financial condition, operations, or cash flows.  Currently, a range of loss associated with any individual material legal proceeding cannot be reasonably estimated.
	On April 23, 2014, Olivistar, LLC (“Olivistar”), a limited liability company organized under the laws of Texas, filed a Complaint against the Company in the Eastern District of Texas.  During April 2014, Olivistar filed similar complaints against many other companies.  Olivistar’s Complaint asserts that the Company’s light switches and MyHome App infringe two United States patents that Olivistar owns by assignment: U.S. Patent No. 6,839,731, or the ‘731 patent, and U.S. Patent No. 8,239,481, or the ‘481 patent.  The Complaint seeks injunctive relief and monetary damages.  Based on the Company’s preliminary investigation of the patents at issue, the Company does not believe the products infringe any valid or enforceable claim of these patents; and, therefore, the Company will vigorously defend the lawsuit.

Description_of_Business_and_Su1

Description of Business and Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2014
Description of Business and Summary of Significant Accounting Policies	'
Basis of Presentation	'
	Basis of Presentation
	The unaudited condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in the unaudited condensed consolidated financial statements.
Segment Reporting	'
	Segment Reporting
	Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision maker, the Chief Executive Officer, in making decisions regarding resource allocation and accessing performance. To date, the Company has viewed its operations and manages its business as one operating segment.
Concentrations of Risk	'
	Concentrations of Risk
	The Company’s accounts receivable are derived from revenue earned from dealers and distributors primarily located in the United States and Canada. The Company’s sales to dealers and distributors located outside the United States are generally denominated in United States dollars, except for sales to dealers and distributors located in the United Kingdom, which are denominated in pounds sterling. There were no individual account balances greater than 10% of total accounts receivable at December 31, 2013 and March 31, 2014.
	No dealer or distributor accounted for more than 10% of total revenue for the three months ended March 31, 2013 and 2014.
	The Company relies on a limited number of suppliers for its contract manufacturing. A significant disruption in the operations of these manufacturers would impact the production of the Company’s products for a substantial period of time, which could have a material adverse effect on the Company’s business, financial condition and results of operations.
Geographic Information	'
	Geographic Information
	The Company’s revenue includes amounts earned through sales to dealers and distributors located outside of the United States. With the exception of Canada, no single foreign country accounted for more than 10% of total revenue for the three months ended March 31, 2013 and 2014. The following table sets forth revenue from the U.S., Canadian and all other international dealers and distributors combined (in thousands):
		Three Months Ended
		March 31,
		2013			2014
	Revenue-United States	$	17,702		$	21,547
	Revenue-Canada	3,345			3,239
	Revenue-all other international sources	5,524			7,069
	Total revenue	$	26,571		$	31,855
	International revenue (excluding Canada) as a percent of total revenue	21		%	22		%
Use of Accounting Estimates	'
	Use of Accounting Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates including those related to revenue recognition, sales returns, provisions for doubtful accounts, product warranty, inventory obsolescence, litigation, determination of fair value of stock options, deferred tax asset valuation allowances and income taxes. Actual results may differ from those estimates.
Product Warranty	'
	Product Warranty
	The Company provides its customers a limited product warranty of two years, which requires the Company to repair or replace (at its option) defective products during the warranty period at no cost to the customer. The Company estimates the costs that may be incurred to replace or repair defective products and records a reserve at the time revenue is recognized. Factors that affect the Company’s warranty liability include the number of installed systems, the Company’s historical experience and management’s judgment regarding anticipated rates of product warranty returns, net of refurbished products. The Company assesses the adequacy of its recorded warranty liability each period and makes adjustments to the liability as necessary. Warranty costs accrued includes amounts accrued for products at the time of shipment, adjustments for changes in estimated costs for warranties on products shipped in the period, and changes in estimated costs for warranties on products shipped in prior periods. It is not practicable for the Company to determine the amounts applicable to each of these components.
	The following table presents the changes in the product warranty liability (in thousands):
		Warranty Liability
	Balance at December 31, 2013	$	1,213
	Warranty costs accrued	204
	Warranty claims	(268		)
	Balance at March 31, 2014	$	1,149
Net Loss Per Share	'
	Net Loss Per Share
	Basic net loss per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed using the weighted-average number of common shares outstanding and potentially dilutive common shares outstanding during the period that have a dilutive effect on net income per share. Potentially dilutive common shares result from the assumed exercise of outstanding stock options and the assumed conversion of outstanding convertible preferred stock and warrants using the if-converted method. In a net loss position, diluted net loss per share is computed using only the weighted-average number of common shares outstanding during the period, as any additional common shares would be anti-dilutive.
	The following table presents the reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share (in thousands):
		Three Months Ended
		March 31,
		2013			2014
	Numerator:
	Net loss	$	(1,471	)	$	(539	)
	Denominator:
	Weighted average common stock outstanding for basic net loss per common share	2,502			23,117
	Effect of dilutive securities—stock options, convertible preferred stock, and warrants to purchase common stock and preferred stock	—			—
	Weighted average common shares and dilutive securities outstanding	2,502			23,117
	The following weighted-average common stock equivalents were anti-dilutive and therefore were excluded from the calculation of diluted net loss per share (in thousands):
		Three Months Ended
		March 31,
		2013		2014
	Convertible preferred stock	15,294		—
	Options to purchase common stock	4,629		4,853
	Warrants to purchase common stock	541		—
	Warrants to purchase preferred stock	194		—
	Total	20,658		4,853
Recent Accounting Pronouncements	'
	Recent Accounting Pronouncements
	In July 2013, the FASB issued ASU 2013-11, ‘‘Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists’’ The amended guidance requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward, except as follows. To the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. Therefore, this new guidance was effective for the Company beginning January 1, 2014. The adoption of this guidance did not have an impact on the Company’s results of operations, financial position, or cash flows as it relates only to financial statement presentation.

Description_of_Business_and_Su2

Description of Business and Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2014
Description of Business and Summary of Significant Accounting Policies	'
Schedule of revenue from U.S., Canadian and all other international dealers and distributors combined	'
	The following table sets forth revenue from the U.S., Canadian and all other international dealers and distributors combined (in thousands):
		Three Months Ended
		March 31,
		2013			2014
	Revenue-United States	$	17,702		$	21,547
	Revenue-Canada	3,345			3,239
	Revenue-all other international sources	5,524			7,069
	Total revenue	$	26,571		$	31,855
	International revenue (excluding Canada) as a percent of total revenue	21		%	22		%
Schedule of changes in the product warranty liability	'
	The following table presents the changes in the product warranty liability (in thousands):
		Warranty Liability
	Balance at December 31, 2013	$	1,213
	Warranty costs accrued	204
	Warranty claims	(268		)
	Balance at March 31, 2014	$	1,149
Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share	'
	The following table presents the reconciliation of the numerator and denominator used in the calculation of basic and diluted net loss per share (in thousands):
		Three Months Ended
		March 31,
		2013			2014
	Numerator:
	Net loss	$	(1,471	)	$	(539	)
	Denominator:
	Weighted average common stock outstanding for basic net loss per common share	2,502			23,117
	Effect of dilutive securities—stock options, convertible preferred stock, and warrants to purchase common stock and preferred stock	—			—
	Weighted average common shares and dilutive securities outstanding	2,502			23,117
Schedule of anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net loss per share	'
	The following weighted-average common stock equivalents were anti-dilutive and therefore were excluded from the calculation of diluted net loss per share (in thousands):
		Three Months Ended
		March 31,
		2013		2014
	Convertible preferred stock	15,294		—
	Options to purchase common stock	4,629		4,853
	Warrants to purchase common stock	541		—
	Warrants to purchase preferred stock	194		—
	Total	20,658		4,853

Balance_Sheet_Components_Table

Balance Sheet Components (Tables)	3 Months Ended
	Mar. 31, 2014
Balance Sheet Components	'
Schedule of inventories	'
	Inventories consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Finished goods	$	14,061		$	16,043
	Component parts	1,251			1,077
		$	15,312		$	17,120
Schedule of property and equipment, net	'
	Property and equipment, net consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Computer equipment and software	$	4,152		$	4,354
	Manufacturing tooling and test equipment	2,652			2,667
	Furniture and fixtures	2,046			2,097
	Lab and warehouse equipment	2,374			2,485
	Marketing equipment	604			604
	Leasehold improvements	1,450			1,436
		13,278			13,643
	Less: accumulated depreciation	(9,335		)	(9,916		)
		$	3,943		$	3,727
Schedule of intangible assets, net	'
	Intangible assets, net consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Acquired technology	$	1,678		$	1,678
	Less: accumulated amortization	(750		)	(848		)
		$	928		$	830
Schedule of other assets	'
	Other assets consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Prepaid licensing	$	716		$	695
	Deposits	404			448
		$	1,120		$	1,143
Schedule of accrued liabilities	'
	Accrued liabilities consisted of the following (in thousands):
		December 31,			March 31,
		2013			2014
	Current portion of settlement obligations (see Note 4)	$	907		$	887
	Sales returns and warranty accruals	2,137			2,152
	Compensation accruals	3,233			1,831
	Other accrued liabilities	544			550
		$	6,821		$	5,420

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Measurements	'
Schedule of cash and available-for-sale investments' adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short- or long-term investments	'
	The following tables show the Company’s cash and available-for-sale investments’ adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short- or long-term investments as of December 31, 2013 and March 31, 2014 (in thousands):
		December 31, 2013
		Adjusted		Unrealized		Unrealized			Fair Value		Cash and		Short-term		Long-term
		Cost		Gains		Losses					Cash		Investments		Investments
											Equivalents
	Cash	$	5,533	$	—	$	—		$	—	$	5,533	$	—	$	—
	Level 1:
	Money market funds	79,013		—		—			—		79,013		—		—
	Subtotal	79,013		—		—			—		79,013		—		—
	Total	$	84,546	$	—	$	—		$	—	$	84,546	$	—	$	—
		March 31, 2014
		Adjusted		Unrealized		Unrealized			Fair Value		Cash and		Short-term		Long-term
		Cost		Gains		Losses					Cash		Investments		Investments
											Equivalents
	Cash	$	8,576	$	—	$	—		$	8,576	$	8,576	$	—	$	—
	Level 1:
	Money market funds	15,510		—		—			15,510		15,510		—		—
	Subtotal	15,510		—		—			15,510		15,510		—		—
	Level 2:
	Asset-backed securities	4,466		—		(1		)	4,465		—		—		4,465
	Corporate bonds	37,085		3		(34		)	37,054		—		19,412		17,642
	Commercial paper	19,980		1		(2		)	19,979		2,799		17,180		—
	Subtotal	61,531		4		(37		)	61,498		2,799		36,592		22,107
	Total	$	85,617	$	4	$	(37	)	$	85,584	$	26,885	$	36,592	$	22,107

LongTerm_Obligations_Tables

Long-Term Obligations (Tables)	3 Months Ended
	Mar. 31, 2014
Long-Term Obligations	'
Schedule of future annual payments on the settlement obligations	'
	Future annual payments on the settlement obligations as of March 31, 2014 are shown in the table below (in thousands):
	2014	$	920
	2015	20
	2016	20
		960
	Less amount representing interest	(33		)
	Present value of settlement obligations	927
	Less current portion of settlement obligations	(887		)
	Long-term portion of settlement obligations	$	40

Equity_Compensation_Tables

Equity Compensation (Tables)	3 Months Ended
	Mar. 31, 2014
Equity Compensation	'
Summary of stock option activity	'
		Shares		Weighted			Weighted			Weighted
		Subject to		Average			Average			Average
		Options		Grant Date			Exercise			Remaining
		Outstanding		Fair Value			Price			Contractual
										Life (Years)
	Balance at December 31, 2013	4,905,214					$	6.31
	Granted	787,244		$	11.82		20.86
	Exercised	(786,201	)				4.06
	Forfeited	(11,783	)				14.39
	Balance at March 31, 2014	4,894,474					8.96
	Exercisable options at March 31, 2014	2,668,667					5.27			5
	Vested and expected to vest at March 31, 2014	4,672,052					8.65			6.6
Summary of stock options outstanding and exercisable	'
	The following table summarizes information about stock options outstanding and exercisable at March 31, 2014:
		Options Outstanding							Options Exercisable
	Range of Exercise Prices	Weighted			Number of		Weighted-		Number of		Weighted-
		Average			Underlying		Average		Underlying		Average
		Exercise			Shares		Remaining		Shares		Remaining
		Price					Contractual				Contractual
							Life (in				Life (in
							years)				years)
	$0.26 - 1.30	$	0.64		63,440		1		63,440		1
	1.35 - 2.60	2.22			299,241		1.8		299,241		1.8
	2.65 - 3.90	3.17			252,213		2.6		252,213		2.6
	3.95 - 5.20	4.87			765,480		3.9		765,480		3.9
	5.25 - 6.50	6.18			1,510,915		7.1		960,056		6.9
	6.55 - 7.80	7.49			108,979		6.3		96,014		6.3
	7.85 - 9.10	8.84			230,734		8.2		101,721		8.2
	9.15 – 22.92	15.89			1,663,472		9.1		130,502		8.7
					4,894,474				2,668,667
Summary of aggregate intrinsic-value of options exercised, exercisable and vested and expected to vest	'
	The following table summarizes the aggregate intrinsic-value of options exercised, exercisable and vested and expected to vest (in thousands):
		For the three months ended
		and as of March 31, 2014
	Options Exercised	$	14,032
	Options Exercisable	42,533
	Options Vested and Expected to Vest	58,783
Schedule of assumptions used to estimate fair value of option awards	'
		Three Months Ended March 31,
		2013		2014
	Expected volatility	—	%	56 – 60	%
	Expected dividends	—	%	0	%
	Expected terms (in years)	—		3.8 – 6.1
	Risk-free rate	—	%	1.1 – 2.0	%
Schedule of total stock-based compensation expense classified in statements of operations	'
	Total stock-based compensation expense has been classified as follows in the accompanying statements of operations (in thousands):
		Three Months Ended March 31,
		2013			2014
	Cost of revenue	$	16		$	20
	Research and development	236			478
	Sales and marketing	184			222
	General and administrative	402			527
	Total stock-based compensation expense	$	838		$	1,247

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2014
Related Party Transactions	'
Schedule of revenue from product sales to companies affiliated with investors	'
	The Company has entered into sales agreements with certain of its investors. The following table sets forth revenue from product sales to companies affiliated with these investors (in thousands):
		Three Months Ended
		March 31,
		2013		2014
	Company 1	$	558	$	707
	Company 2	126		161
	Company 3	285		—
	Company 4	119		—
		$	1,088	$	868

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2014
Commitments and Contingencies	'
Schedule of future minimum rental payments required under non-cancelable operating leases	'
	Future minimum rental payments required under non-cancelable operating leases with initial or remaining terms in excess of one year consist of the following as of March 31, 2014 (in thousands):
	2014	$	1,234
	2015	1,665
	2016	1,553
	2017	1,332
	2018	722
	Thereafter	—
		$	6,506

Description_of_Business_and_Su3

Description of Business and Summary of Significant Accounting Policies (Details)	3 Months Ended
	Mar. 31, 2014
	item
Segment Reporting	'
Number of operating segments	1

Description_of_Business_and_Su4

Description of Business and Summary of Significant Accounting Policies (Details 2) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Revenue from U.S., Canadian and all other international dealers and distributors combined	'	'
Total revenue	$31,855	$26,571
International revenue (excluding Canada) as a percent of total revenue	22.00%	21.00%
United States	'	'
Revenue from U.S., Canadian and all other international dealers and distributors combined	'	'
Total revenue	21,547	17,702
Canada	'	'
Revenue from U.S., Canadian and all other international dealers and distributors combined	'	'
Total revenue	3,239	3,345
All other international sources	'	'
Revenue from U.S., Canadian and all other international dealers and distributors combined	'	'
Total revenue	$7,069	$5,524

Description_of_Business_and_Su5

Description of Business and Summary of Significant Accounting Policies (Details 3) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014
Product Warranty	'
Product warranty period	'2 years
Changes in the product warranty liability	'
Balance at beginning of period	$1,213
Warranty costs accrued	204
Warranty claims	-268
Balance at end of period	$1,149

Description_of_Business_and_Su6

Description of Business and Summary of Significant Accounting Policies (Details 4) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Numerator:	'	'
Net loss	($539)	($1,471)
Denominator:	'	'
Weighted average common stock outstanding for basic net loss per common share (in shares)	23,117	2,502
Weighted average common shares and dilutive securities outstanding	23,117	2,502
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share	'	'
Total (in shares)	4,853	20,658
Convertible preferred stock	'	'
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share	'	'
Total (in shares)	'	15,294
Options to purchase common stock	'	'
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share	'	'
Total (in shares)	4,853	4,629
Warrants to purchase common stock	'	'
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share	'	'
Total (in shares)	'	541
Warrants to purchase preferred stock	'	'
Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income (loss) per share	'	'
Total (in shares)	'	194

Balance_Sheet_Components_Detai

Balance Sheet Components (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventories	'	'
Finished goods	$16,043	$14,061
Component parts	1,077	1,251
Total inventories	17,120	15,312
Property and equipment, net	'	'
Property and equipment, gross	13,643	13,278
Less: accumulated depreciation	-9,916	-9,335
Property and equipment, net	3,727	3,943
Computer equipment and software	'	'
Property and equipment, net	'	'
Property and equipment, gross	4,354	4,152
Manufacturing tooling and test equipment	'	'
Property and equipment, net	'	'
Property and equipment, gross	2,667	2,652
Furniture and fixtures	'	'
Property and equipment, net	'	'
Property and equipment, gross	2,097	2,046
Lab and warehouse equipment	'	'
Property and equipment, net	'	'
Property and equipment, gross	2,485	2,374
Marketing equipment	'	'
Property and equipment, net	'	'
Property and equipment, gross	604	604
Leasehold improvements	'	'
Property and equipment, net	'	'
Property and equipment, gross	$1,436	$1,450

Balance_Sheet_Components_Detai1

Balance Sheet Components (Details 2) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Intangible assets, net	'	'
Intangible assets, net	$830	$928
Other assets	'	'
Prepaid licensing	695	716
Deposits	448	404
Other assets total	1,143	1,120
Accrued liabilities	'	'
Current portion of settlement obligations	887	907
Sales returns and warranty accruals	2,152	2,137
Compensation accruals	1,831	3,233
Other accrued liabilities	550	544
Total accrued liabilities	5,420	6,821
Acquired technology	'	'
Intangible assets, net	'	'
Intangible assets, gross	1,678	1,678
Less: accumulated amortization	-848	-750
Intangible assets, net	$830	$928

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

Dec. 31, 2013

Mar. 31, 2014

In Thousands, unless otherwise specified

Minimum

Maximum

Cash and Cash Equivalents

Cash and Cash Equivalents

Short-term investments

Long-term investments

Cash

Cash

Money market funds

Money market funds

Available-for-sale investments

Available-for-sale investments

Available-for-sale investments

Available-for-sale investments

Asset-backed securities

Asset-backed securities

Corporate bonds

Corporate bonds

Corporate bonds

Commercial paper

Commercial paper

Commercial paper

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Measured on a recurring basis

Carrying amount

Carrying amount

Carrying amount

Carrying amount

Carrying amount

Fair value

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and Cash Equivalents

Short-term investments

Long-term investments

Long-term investments

Short-term investments

Long-term investments

Cash and Cash Equivalents

Short-term investments

Level 1

Level 1

Level 1

Level 1

Level 2

Level 2

Level 2

Level 2

Cash

Cash

Money market funds

Money market funds

Cash

Money market funds

Money market funds

Asset-backed securities

Corporate bonds

Commercial paper

Fair Value Measurements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and Cash Equivalents

'

'

'

'

'

'

'

$8,576

$5,533

$15,510

$79,013

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$15,510

$79,013

'

'

'

'

$84,546

$8,576

$5,533

$15,510

$79,013

$8,576

Adjusted Cost

'

'

'

'

'

'

'

'

'

'

'

61,531

'

'

'

4,466

'

37,085

'

'

19,980

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized Gains

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

3

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized Losses

'

'

'

'

'

'

'

'

'

'

'

-37

'

'

'

-1

'

-34

'

'

-2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value

'

'

'

'

'

'

'

'

'

'

'

'

2,799

36,592

22,107

'

4,465

'

19,412

17,642

'

2,799

17,180

'

'

'

'

'

61,498

4,465

37,054

19,979

'

'

'

'

'

'

Total Cash and Cash Equivalents and Investments, Adjusted Cost

85,617

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total assets, fair value

'

'

'

$26,885

$84,546

$36,592

$22,107

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$85,584

$15,510

$79,013

'

'

'

'

'

'

'

'

'

'

'

'

Maturity period of long-term investments

'

'1 year

'2 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

LongTerm_Obligations_Details

Long-Term Obligations (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2013	Mar. 31, 2014	Jun. 30, 2013	Jun. 30, 2013	Mar. 31, 2014
			Revolving credit facility	Revolving credit facility	Revolving credit facility	Revolving credit facility	Term borrowings	Term borrowings	Term borrowings	Unsecured notes payable
					LIBOR	Prime rate	item		Prime rate
Long-Term Obligations	'	'	'	'	'	'	'	'	'	'
Maximum borrowing capacity	'	'	$13,000,000	'	'	'	'	$2,750,000	'	'
Variable interest rate basis	'	'	'	'	'LIBOR	'prime	'	'	'prime	'
Basis spread on variable rate (as a percent)	'	'	'	'	2.50%	'	'	'	0.50%	'
Interest rate at the end of period (as a percent)	'	'	'	3.25%	'	'	3.75%	'	'	'
Annual commitment fee	'	'	20,000	'	'	'	'	'	'	'
Commitment fee for quarterly unused capacity (as a percent)	'	'	0.38%	'	'	'	'	'	'	'
Number of equal monthly payments of principal plus interest	'	'	'	'	'	'	33	'	'	'
Current borrowing capacity	'	'	'	13,000,000	'	'	2,000,000	'	'	'
Borrowings outstanding	'	'	'	0	'	'	'	'	'	'
Settlement Obligation	'	'	'	'	'	'	'	'	'	'
Implied interest rate (as a percent)	'	'	'	'	'	'	'	'	'	3.75%
Future annual payments on the settlement obligations	'	'	'	'	'	'	'	'	'	'
2014	920,000	'	'	'	'	'	'	'	'	'
2015	20,000	'	'	'	'	'	'	'	'	'
2016	20,000	'	'	'	'	'	'	'	'	'
Total	960,000	'	'	'	'	'	'	'	'	'
Less amount representing interest	-33,000	'	'	'	'	'	'	'	'	'
Present value of settlement obligations	927,000	'	'	'	'	'	'	'	'	'
Less current portion of settlement obligations	-887,000	-907,000	'	'	'	'	'	'	'	'
Long-term portion of settlement obligations	$40,000	'	'	'	'	'	'	'	'	'

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Income Taxes	'	'
Income tax benefit (expense)	$0	$56
Effective income tax rate (as a percent)	0.00%	4.00%
U.S. federal statutory rate (as a percent)	34.00%	'
Minimum period for which net operating loss and credit carryforwards are subject to examinations and adjustments	'3 years	'

Equity_Compensation_Details

Equity Compensation (Details) (Stock options, USD $)	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Jan. 02, 2014	Jun. 11, 2013
		2013 Plan	2013 Plan
Stock options	'	'	'
Annual increase in shares authorized for issuance as a percentage of shares outstanding as of the preceding December 31	'	'	5.00%
Increase in number of shares authorized for issuance	'	1,139,255	'
Shares Subject to Options Outstanding	'	'	'
Balance at the beginning of the period (in shares)	4,905,214	'	'
Granted (in shares)	787,244	'	'
Exercised (in shares)	-786,201	'	'
Forfeited (in shares)	-11,783	'	'
Balance at the end of the period (in shares)	4,894,474	'	'
Exercisable options (in shares)	2,668,667	'	'
Vested and expected to vest at the end of the period (in shares)	4,672,052	'	'
Weighted Average Grant Date Fair Value	'	'	'
Granted (in dollars per share)	$11.82	'	'
Weighted Average Exercise Price	'	'	'
Balance at the beginning of the period (in dollars per share)	$6.31	'	'
Granted (in dollars per share)	$20.86	'	'
Exercised (in dollars per share)	$4.06	'	'
Forfeited (in dollars per share)	$14.39	'	'
Balance at the end of the period (in dollars per share)	$8.96	'	'
Exercisable options at the end of the period (in dollars per share)	$5.27	'	'
Vested and expected to vest (in dollars per share)	$8.65	'	'
Weighted-Average Remaining Contractual Life	'	'	'
Exercisable options	'5 years	'	'
Vested and expected to vest	'6 years 7 months 6 days	'	'

Equity_Compensation_Details_2

Equity Compensation (Details 2) (Stock Options, USD $)	3 Months Ended
	Mar. 31, 2014
Options Outstanding	'
Number of Underlying Shares	4,894,474
Options Exercisable	'
Number of Underlying Shares	2,668,667
0.26-1.30	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$0.26
Range of Exercise Price, high end of range (in dollars per share)	$1.30
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$0.64
Number of Underlying Shares	63,440
Weighted-Average Remaining Contractual Life	'1 year
Options Exercisable	'
Number of Underlying Shares	63,440
Weighted-Average Remaining Contractual Life	'1 year
1.35-2.60	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$1.35
Range of Exercise Price, high end of range (in dollars per share)	$2.60
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$2.22
Number of Underlying Shares	299,241
Weighted-Average Remaining Contractual Life	'1 year 9 months 18 days
Options Exercisable	'
Number of Underlying Shares	299,241
Weighted-Average Remaining Contractual Life	'1 year 9 months 18 days
2.65-3.90	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$2.65
Range of Exercise Price, high end of range (in dollars per share)	$3.90
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$3.17
Number of Underlying Shares	252,213
Weighted-Average Remaining Contractual Life	'2 years 7 months 6 days
Options Exercisable	'
Number of Underlying Shares	252,213
Weighted-Average Remaining Contractual Life	'2 years 7 months 6 days
3.95-5.20	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$3.95
Range of Exercise Price, high end of range (in dollars per share)	$5.20
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$4.87
Number of Underlying Shares	765,480
Weighted-Average Remaining Contractual Life	'3 years 10 months 24 days
Options Exercisable	'
Number of Underlying Shares	765,480
Weighted-Average Remaining Contractual Life	'3 years 10 months 24 days
5.25-6.50	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$5.25
Range of Exercise Price, high end of range (in dollars per share)	$6.50
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$6.18
Number of Underlying Shares	1,510,915
Weighted-Average Remaining Contractual Life	'7 years 1 month 6 days
Options Exercisable	'
Number of Underlying Shares	960,056
Weighted-Average Remaining Contractual Life	'6 years 10 months 24 days
6.55-7.80	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$6.55
Range of Exercise Price, high end of range (in dollars per share)	$7.80
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$7.49
Number of Underlying Shares	108,979
Weighted-Average Remaining Contractual Life	'6 years 3 months 18 days
Options Exercisable	'
Number of Underlying Shares	96,014
Weighted-Average Remaining Contractual Life	'6 years 3 months 18 days
7.85-9.10	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$7.85
Range of Exercise Price, high end of range (in dollars per share)	$9.10
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$8.84
Number of Underlying Shares	230,734
Weighted-Average Remaining Contractual Life	'8 years 2 months 12 days
Options Exercisable	'
Number of Underlying Shares	101,721
Weighted-Average Remaining Contractual Life	'8 years 2 months 12 days
9.15-22.92	'
Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit)	'
Range of Exercise Price, low end of range (in dollars per share)	$9.15
Range of Exercise Price, high end of range (in dollars per share)	$22.92
Options Outstanding	'
Weighted Average Exercise Price (in dollars per share)	$15.89
Number of Underlying Shares	1,663,472
Weighted-Average Remaining Contractual Life	'9 years 1 month 6 days
Options Exercisable	'
Number of Underlying Shares	130,502
Weighted-Average Remaining Contractual Life	'8 years 8 months 12 days

Equity_Compensation_Details_3

Equity Compensation (Details 3) (Stock options, USD $)	3 Months Ended
	Mar. 31, 2014
Stock options	'
Total fair value for the awards vested during the period	$900,000
Intrinsic-value	'
Options Exercised	14,032,000
Options Exercisable	42,533,000
Options Vested and Expected to Vest	$58,783,000
Assumptions used to estimate fair value of stock options	'
Expected dividends (as a percent)	0.00%
Minimum	'
Assumptions used to estimate fair value of stock options	'
Expected volatility (as a percent)	56.00%
Expected term	'3 years 9 months 18 days
Risk-free rate (as a percent)	1.10%
Maximum	'
Assumptions used to estimate fair value of stock options	'
Expected volatility (as a percent)	60.00%
Expected term	'6 years 1 month 6 days
Risk-free rate (as a percent)	2.00%

Equity_Compensation_Details_4

Equity Compensation (Details 4) (Stock options, USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Total stock-based compensation expense	'	'
Total stock-based compensation expense	$1,247,000	$838,000
Total unrecognized compensation cost related to non-vested stock option awards	17,400,000	'
Weighted-average period over which unrecognized compensation cost will be recognized	'3 years 3 months 18 days	'
Cost of revenue	'	'
Total stock-based compensation expense	'	'
Total stock-based compensation expense	20,000	16,000
Research and development	'	'
Total stock-based compensation expense	'	'
Total stock-based compensation expense	478,000	236,000
Sales and marketing	'	'
Total stock-based compensation expense	'	'
Total stock-based compensation expense	222,000	184,000
General and administrative	'	'
Total stock-based compensation expense	'	'
Total stock-based compensation expense	$527,000	$402,000

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Related Party Transactions	'	'	'
Revenue from product sales	$868,000	$1,088,000	'
Accounts receivable	600,000	'	600,000
Investors | Company 1	'	'	'
Related Party Transactions	'	'	'
Revenue from product sales	707,000	558,000	'
Investors | Company 2	'	'	'
Related Party Transactions	'	'	'
Revenue from product sales	161,000	126,000	'
Investors | Company 3	'	'	'
Related Party Transactions	'	'	'
Revenue from product sales	'	285,000	'
Investors | Company 4	'	'	'
Related Party Transactions	'	'	'
Revenue from product sales	'	$119,000	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Leases	'	'
Rental expense	$300,000	$300,000
Future minimum rental payments	'	'
2014	1,234,000	'
2015	1,665,000	'
2016	1,553,000	'
2017	1,332,000	'
2018	722,000	'
Total	6,506,000	'
Purchase Commitments	'	'
Non-cancellable purchase commitments	$20,300,000	'
Minimum	'	'
Operating Leases	'	'
Extension term of leases	'3 years	'
Maximum	'	'
Operating Leases	'	'
Extension term of leases	'5 years	'

Commitments_and_Contingencies_2

Commitments and Contingencies (Details 2) (Subsequent event, Olivistar, LLC, Pending litigation)	Apr. 23, 2014
	item
Subsequent event | Olivistar, LLC | Pending litigation	'
Patent litigation	'
Number of patents infringed	2