Stock-Based Compensation and Warrants - Additional Information (Detail) | Feb. 12, 2020$ / sharesshares | Feb. 03, 2020$ / sharesshares | Mar. 28, 2019shares | May 20, 2015shares | May 14, 2015 | May 31, 2020$ / sharesshares | Feb. 29, 2020$ / sharesshares | Sep. 30, 2019$ / sharesshares | Aug. 31, 2019$ / sharesshares | Jul. 31, 2019$ / sharesshares | Jun. 30, 2019$ / sharesshares | Apr. 30, 2019$ / sharesshares | Sep. 30, 2019$ / sharesshares | Jun. 30, 2020USD ($)$ / sharesshares | Jun. 30, 2019USD ($)$ / sharesshares | Sep. 30, 2018 | Jun. 30, 2020USD ($)IncentivePlan$ / sharesshares | Jun. 30, 2019USD ($)$ / sharesshares | May 18, 2020$ / sharesshares | Mar. 31, 2020shares | Dec. 31, 2019shares | Sep. 05, 2019$ / sharesshares | Jun. 30, 2014$ / sharesshares |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of equity incentive plans | IncentivePlan | | | | | | | | | | | | | | | | | 2 | | | | | | |
Total number of options outstanding | | | | | | | | | | | | | | 996,615 | | | 996,615 | | | | 661,701 | | |
Unrecognized compensation cost related to unvested stock-based compensation grants | $ | | | | | | | | | | | | | | $ 1,600,000 | | | $ 1,600,000 | | | | | | |
Weighted-average remaining recognition period | | | | | | | | | | | | | | | | | 2 years 7 months 6 days | | | | | | |
Options granted | | | | | | | | | | | | | | | | | 430,468 | 184,071 | | | | | |
Stock-based compensation | $ | | | | | | | | | | | | | | | | | $ 1,367,000 | $ 811,000 | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 4,418,618 | | | 4,418,618 | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | | | $ 7.32 | | | $ 7.32 | | | | | | |
Service Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | $ 6.18 | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | | 45,154 | | | | | | | | | | | |
Warrants vesting period | | | | | | | | | | | | 12 months | | | | | | | | | | | |
Warrant, exercisable term | | | | | | | | | | | | 5 years | | | | | | | | | | | |
Stock compensation expense associated with Warrants, term | | | | | | | | | | | | | | | | | | 1 year | | | | | |
Compensation expense associated with Warrants | $ | | | | | | | | | | | | | | $ 21,000 | $ 44,000 | | $ 145,000 | $ 44,000 | | | | | |
Performance Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | $ 6.18 | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | | 100,000 | | | | | | | | | | | |
Warrant, exercisable term | | | | | | | | | | | | 5 years | | | | | | | | | | | |
Exercise Price of Warrants Four Point Nine One [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants vesting period | | 12 months | | | | | | | | | | | | | | | | | | | | | |
Warrant, exercisable term | | 2 years | | | | | | | | | | | | | | | | | | | | | |
Stock compensation expense associated with Warrants, term | | 12 months | | | | | | | | | | | | | | | | | | | | | |
Compensation expense associated with Warrants | $ | | | | | | | | | | | | | | 9,400 | | | 18,800 | | | | | | |
Exercise Price of Warrants Four Point Seven One [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | $ 4.71 | | | | | | | | | | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | 150,000 | | | | | | | | | | | | | | | | | | | | | | |
Warrants vesting period | 12 months | | | | | | | | | | | | | | | | | | | | | | |
Warrant, exercisable term | 2 years | | | | | | | | | | | | | | | | | | | | | | |
Stock compensation expense associated with Warrants, term | 12 months | | | | | | | | | | | | | | | | | | | | | | |
Compensation expense associated with Warrants | $ | | | | | | | | | | | | | | 135,400 | | | 270,800 | | | | | | |
Exercise Price of Service Warrants Four Point Nine One [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | $ 2.50 | | | | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | 18,350 | | | | | | | | | | | | | | | | |
Warrant, exercisable term | | | | | | | 3 years | | | | | | | | | | | | | | | | |
Compensation expense associated with Warrants | $ | | | | | | | | | | | | | | $ 0 | | | $ 36,700 | | | | | | |
June 2019 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 510,309 | | | 510,309 | | | | | | |
September 2019 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 725,356 | | | 725,356 | | | | | | |
September 2019 Purchase Agreement [Member] | Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | | | | | | | | | | | $ 7.52 | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | | | | | | | | | | | | 659,414 | |
May 2020 Warrant Exercise Transaction [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 1,461,962 | | | 1,461,962 | | | | | | |
May 2020 Warrant Exercise Transaction [Member] | Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | $ 4.775 | | | | | | | | | | | | | $ 4.90 | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | 1,392,345 | | | | | | | | | | | | | 1,392,345 | | | | |
Warrant, exercisable term | | | | | | 5 years | | | | | | | | | | | | | | | | | |
Independent Contractor [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | $ 2.19 | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | 10,000 | | | | | | | | | | | | | |
Independent Contractor [Member] | Exercise Price of Warrants Four Point Nine One [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | $ 4.91 | | | | | | | | | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | 10,000 | | | | | | | | | | | | | | | | | | | | | |
Two Affiliated Third Parties [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | $ 1.92 | | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | 20,000 | | | | | | | | | | | | | | |
Placement Agent [Member] | June 2019 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | $ 6.2938 | | | | $ 6.2938 | | | $ 6.2938 | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | 74,479 | | | | 74,479 | | | 74,479 | | | | | |
Warrant, exercisable term | | | | | | | | | | | 5 years | | | | | | | | | | | | |
Placement Agent [Member] | September 2019 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | $ 9.4781 | | | | | $ 9.4781 | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | 65,942 | | | | | 65,942 | | | | | | | | | | |
Warrant, exercisable term | | | | | | | | 5 years | | | | | | | | | | | | | | | |
Placement Agent [Member] | May 2020 Warrant Exercise Transaction [Member] | Warrants [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | $ 6.125 | | | | | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | 69,617 | | | | | | | | | | | | | | | | | |
Warrant, exercisable term | | | | | | 5 years | | | | | | | | | | | | | | | | | |
Series D Redeemable Convertible Preferred Stock [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | | | | | | | | | | | | | 63,071 |
Number of warrants expired | | | 1,759 | | | | | | | | | | | | 61,312 | | | | | | | | |
Series D Redeemable Convertible Preferred Stock [Member] | Investor [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | | | | | | | | | | | | $ 363.20 |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | | | | | | | | | | | | | 61,397 |
Series D Redeemable Convertible Preferred Stock [Member] | Placement Agent [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | | | | | | | | | | | | $ 268.80 |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | | | | | | | | | | | | | 1,674 |
2015 Employee Stock Purchase Plan [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Total number of shares reserved for issuance under plan | | | | | | | | | | | | | | | | | | | | 116,757 | | | |
Percentage in payroll deductions to acquire shares of common stock | | | | | 15.00% | | | | | | | | | | | | | | | | | | |
Purchase plan offering period | | | | | 6 months | | | | | | | | | | | | | | | | | | |
Employees are able to purchase company's common stock on first trading day of offering period, percentage | | | | | 85.00% | | | | | | | | | | | | | | | | | | |
Issuance of common stock pursuant to employee stock purchase plan | | | | | | | | | | | | | | | | | 23,335 | | | | | | |
Stock-based compensation | $ | | | | | | | | | | | | | | $ 15,500 | $ 3,800 | | $ 28,200 | $ 8,100 | | | | | |
Purchase Agreement [Member] | March 2018 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 1,297,870 | | | 1,297,870 | | | | | | |
Purchase Agreement [Member] | March 2018 Purchase Agreement [Member] | Purchase Price of $10.7258 [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 1,282,832 | | | 1,282,832 | | | | | | |
Warrants issued, purchase price of warrants per share | $ / shares | | | | | | | | | | | | | | $ 10.7258 | | | $ 10.7258 | | | | | | |
Purchase Agreement [Member] | March 2018 Purchase Agreement [Member] | Exercise Price of $41.5625 [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 15,038 | | | 15,038 | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | | | $ 41.5625 | | | $ 41.5625 | | | | | | |
Purchase Agreement [Member] | June 2018 Offering [Member] | Exercise Price of $12.568 [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Number of warrant to purchase common stock issued | | | | | | | | | | | | | | 69,617 | | | 69,617 | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | | | | $ 12.568 | | | $ 12.568 | | | | | | |
Purchase Agreement [Member] | June 2019 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | | | | $ 5 | | | | $ 5 | | | $ 5 | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | | | | 1,489,575 | | | | 1,489,575 | | | 1,489,575 | | | | | |
Warrants issued, purchase price of warrants per share | $ / shares | | | | | | | | | | | $ 0.125 | | | | $ 0.125 | | | $ 0.125 | | | | | |
Warrant, exercisable term | | | | | | | | | | | 5 years 6 months | | | | | | | | | | | | |
Class of warrant or right, issued percentage in connection with common stock sold | | | | | | | | | | | 100.00% | | | | | | | | | | | | |
Investors exercised warrants and purchase shares of common stock | | | | | | | | | | | | | 1,053,745 | | | | | | | | | | |
Purchase Agreement [Member] | September 2019 Purchase Agreement [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants issued, exercise price | $ / shares | | | | | | | | $ 7.52 | | | | | $ 7.52 | | | | | | | | | | |
Warrant issued, shares of common stock called by warrant | | | | | | | | 659,414 | | | | | 659,414 | | | | | | | | | | |
Warrants issued, purchase price of warrants per share | $ / shares | | | | | | | | $ 0.125 | | | | | $ 0.125 | | | | | | | | | | |
Warrant, exercisable term | | | | | | | | 5 years 6 months | | | | | | | | | | | | | | | |
Class of warrant or right, issued percentage in connection with common stock sold | | | | | | | | 50.00% | | | | | | | | | | | | | | | |
July 2019 Offering [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrants vesting period | | | | | | | | | | 12 months | | | | | | | | | | | | | |
Warrant, exercisable term | | | | | | | | | | 2 years | | | | | | | | | | | | | |
Stock compensation expense associated with Warrants, term | | | | | | | | | | 12 months | | | | | | | | | | | | | |
Compensation expense associated with Warrants | $ | | | | | | | | | | | | | | $ 4,000 | | | $ 8,000 | | | | | | |
August 2019 Offering [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrant, exercisable term | | | | | | | | | 2 years | | | | | | | | | | | | | | |
Warrants issuance date | | | | | | | | | Aug. 5, 2019 | | | | | | | | | | | | | | |
Maximum [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrant, expiration date | | | | | | | | | | | | | | | | | 2025-05 | | | | | | |
Minimum [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Warrant, expiration date | | | | | | | | | | | | | | | | | 2021-07 | | | | | | |
2015 Omnibus Equity Incentive Plan [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Terms under the plan | | | | | | | | | | | | | | | | | The 2015 Plan became effective in May 2015 and all shares that were reserved, but not issued, under the 2006 Plan were assumed by the 2015 Plan. Upon effectiveness, the 2015 Plan had 154,387 shares of common stock reserved for future issuance, which included 10,637 shares under the 2006 Plan that were transferred to and assumed by the 2015 Plan. The 2015 Plan provides for automatic annual increases in shares available for grant. In addition, shares subject to awards under the 2006 Plan that are forfeited or canceled will be added to the 2015 Plan. | | | | | | |
Total number of shares reserved for issuance under plan | | | | 154,387 | | | | | | | | | | 1,046,924 | | | 1,046,924 | | | | | | |
Options vesting period | | | | 4 years | | | | | | | | | | | | 2 years | | | | | | | |
Additional shares authorized for issuance under the plan | | | | | | | | | | | 120,000 | | | | | | | | | | | | |
Common stock available for future grant | | | | | | | | | | | | | | 69,800 | | | 69,800 | | | | | | |
Total number of options outstanding | | | | | | | | | | | | | | 977,124 | | | 977,124 | | | | | | |
2015 Omnibus Equity Incentive Plan [Member] | Maximum [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Options exercisable period | | | | 10 years | | | | | | | | | | | | | | | | | | | |
2006 Stock Incentive Plan [Member] | | | | | | | | | | | | | | | | | | | | | | | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | | | | | | | | | | | | | | | | | | | | | |
Total number of shares reserved for issuance under plan | | | | 10,637 | | | | | | | | | | | | | | | | | | | |
Total number of options outstanding | | | | | | | | | | | | | | 19,491 | | | 19,491 | | | | | | |