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Description of Business - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Installment | Dec. 31, 2015 USD ($) | Jun. 13, 2016 USD ($)
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Net loss | $ 17,971,000 | $ 14,704,000 |
Net cash used in operating activities | 14,213,000 | 16,420,000 |
Accumulated deficit | $ 279,188,000 | $ 261,217,000 |
Senior Secured Convertible Notes [Member] |  |  |
Organization Consolidation and Presentation of Financial Statements [Line Items] |  |  |
Debt instrument, original issuance date | Jun. 13, 2016 |  |
Debt instrument, principal face amount | $ 34,351,000 |  | $ 35,000,000
Debt instrument payable number of equal installments | Installment | 14 |  |

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