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Stock-Based Compensation - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) Plan $ / shares shares | Dec. 31, 2018 USD ($) | Aug. 01, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock compensation plans | Plan | 2 |  |
Common stock reverse stock split ratio | 0.111111111 |  |
Common stock reverse stock split description | one for nine |  |
Aggregate intrinsic value of options exercised | $ | $ 0 | $ 0 |
Unrecognized stock-based compensation expense | $ | $ 1,300,000 |  |
Unrecognized stock-based compensation expense, recognized over estimated weighted average period | 2 years 2 months 12 days |  |
Stock-based compensation expense | $ | $ 1,308,000 | $ 1,543,000 |
PRSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ | $ 0 |  |
Number of shares vested | 78,450 |  |
Value of shares vested | $ | $ 379,000 |  |
Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of exercise prices | $ / shares | $ 119.25 |  |
Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Range of exercise prices | $ / shares | $ 0.67 |  |
2014 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized for issuance | 1,700,000 |  | 337,955
Maximum annual increase in common stock reserved for future issuance | 1,800,000 |  |
Additional shares of common stock, percentage | 400.00% |  |
Options granted, expiration period | 10 years |  |
Number of shares of common stock authorized issuance reduced |  |  | 766,500
Stock awards available for grant | 337,955 |  |
2007 Stock Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of options outstanding | 84,612 |  |
Options granted, expiration period | 10 years |  |
2014 Stock Incentive Plan Under Evergreen Provision [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares of common stock authorized issuance reduced |  |  | 550,000
2014 Employee Stock Purchase Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized for issuance | 303,721 |  | 209,500
2014 Employee Stock Purchase Plan Under Evergreen Provision [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares authorized for issuance |  |  | 135,000

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