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Stock Benefit Plans and Equity Transactions - Additional Information (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2017 | Mar. 22, 2017 | Oct. 31, 2016 | Mar. 31, 2017 | Mar. 30, 2017 | Mar. 01, 2017 | Dec. 31, 2016 | Oct. 04, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Series A convertible preferred stock, shares issued |  |  |  |  | 15,000 |  | 0 |
Exercise price of warrants (dollars per share) |  | $ 2.00 |  |  |  |  |  |
Warrant expiration period |  | 5 years |  |  |  |  |  |
Preferred stock, stated value per share |  |  |  |  | $ 0.0001 |  | $ 0.0001 |
Wainwright Warrants |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Exercise price of warrants (dollars per share) |  |  |  |  |  | $ 2.50 |  |
Aggregate gross proceeds for private placement | $ 18,900,000 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Beneficial ownership limitation percentage |  |  |  | 4.99% |  |  |  |
Beneficial ownership, limitation option, percentage |  |  |  | 9.99% |  |  |  |
Beneficial ownership limitation notification period |  |  |  | 61 days |  |  |  |
Maximum | Certificate Of Designation |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Convertible preferred stock, percentage of shares issuable upon conversion | 19.99% |  |  |  |  |  |  |
Maximum | Wainwright Warrants |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of warrants issued (in shares) |  |  |  |  |  | 471,600 |  |
Minimum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Percentage of outstanding voting stock acquired |  |  |  | 50.00% |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issuance of common stock upon securities purchase agreement |  | 1,809,628 |  |  |  |  |  |
Common stock purchase price share |  | $ 2.00 |  |  |  |  |  |
Common Stock | Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of warrants issued (in shares) |  | 9,432,000 |  |  |  |  |  |
Common Stock | Certain Directors and Executive Officers | Maximum |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of warrants issued (in shares) |  | 1,175,000 |  |  |  |  |  |
Series A convertible preferred stock |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Series A convertible preferred stock, shares issued |  | 15,245 |  |  |  |  |  |
Shares issued price per share |  | $ 1,000 |  |  |  |  |  |
Percentage of outstanding preferred stock shares | 75.00% |  |  |  |  |  |  |
Series A convertible preferred stock | Certificate Of Designation |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred stock convertible to common stock | 500,000 |  |  |  |  |  |  |
Preferred stock, stated value per share | $ 1,000 |  |  |  |  |  |  |
Series A convertible preferred stock | Certain Directors and Executive Officers |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred stock convertible to common stock |  | 1,175,000 |  |  |  |  |  |
Aggregate amount of convertible preferred shares purchased |  | $ 2,350,000 |  |  |  |  |  |
Series A convertible preferred stock | Common Stock |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Preferred stock convertible to common stock |  | 7,622,372 |  |  |  |  |  |
Inducement Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock reserved for future issuance |  |  |  |  | 600,000 |  |  | 1,550,000
Maximum award to be deductible other than options |  |  |  |  |  |  |  | $ 1,000,000
Stock options granted in period |  |  | 175,000 |  |  |  |  |
RSUs | Inducement Plan |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Equity instruments other than options granted in period (in shares) |  |  | 175,000 |  |  |  |  |

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