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Organization and Description of Business - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 15, 2017 USD ($) | Aug. 13, 2014 shares | Jul. 22, 2014 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) Segment $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) shares | Apr. 18, 2017 $ / d | Jul. 01, 2014 shares | Dec. 31, 2013 USD ($)
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  | 2 |  |  |  |  |
Accumulated deficit |  |  |  | $ 212,553 | $ 173,084 |  |  |  |
Cash and cash equivalents |  |  |  | 17,258 | 29,888 | $ 36,431 |  |  | $ 5,128
Debt outstanding under debt and capital lease obligations |  |  |  | 24,000 |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | $ 0 | $ 15,625 | 0 |  |  |
Reverse stock split |  |  |  | 1 for 6.85 |  |  |  |  |
Reverse stock split, ratio |  |  |  | 0.145985401 |  |  |  |  |
Reverse Stock Split effective date |  |  |  | Jul. 14, 2014 |  |  |  |  |
Common stock, shares authorized | shares |  |  | 100,000,000 | 100,000,000 | 100,000,000 |  |  | 10,000,000 |
Common stock, par value | $ / shares |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |
Preferred stock, shares authorized | shares |  |  | 10,000,000 | 10,000,000 | 10,000,000 |  |  |  |
Preferred stock, par value | $ / shares |  |  | $ 0.001 | $ 0.001 | $ 0.001 |  |  |  |
Underwriting discounts and commissions |  |  |  | $ 0 | $ 0 | 3,733 |  |  |
Proceeds from initial public offering net of underwriting discounts and commissions |  |  |  | 0 | $ 0 | $ 39,246 |  |  |
Convertible note principal amount |  |  |  | $ 5 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  |  |  |  | 510,777 |  |  |
Shares issued upon conversion | shares |  |  | 6,048,220 | 4,630,145 |  |  |  |  |
Convertible note principal amount |  |  |  | $ 5 |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  |  | 4,000,000 |  |  |  |  |  |
Common stock offer price per share | $ / shares |  |  | $ 10.00 |  |  |  |  |  |
Underwriting discounts and commissions |  |  | $ 3,000 |  |  |  |  |  |
Proceeds from initial public offering net of underwriting discounts and commissions |  |  | 39,200 |  |  |  |  |  |
Offering expenses |  |  | 3,700 |  |  |  |  |  |
Net proceeds from issuance of initial public offering |  |  | $ 35,500 |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Common stock shares issued | shares |  | 220,000 |  |  |  |  |  |  |
Convertible Subordinated Debt [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Shares issued upon conversion | shares |  |  | 510,777 |  |  |  |  |  |
Convertible note principal amount |  |  | $ 5,000 |  |  |  |  |  |
Subsequent Event [Member] | JGB Debt [Member] |  |  |  |  |  |  |  |  |
Schedule of Capitalization, Equity [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs | $ 24,000 |  |  |  |  |  |  |  |
Pay-off of term debt | 11,200 |  |  |  |  |  |  |  |
Minimum cash requirement | $ 9,400 |  |  |  |  |  |  |  |
Accruing liquidated damages payable amount per day | $ / d |  |  |  |  |  |  | 7,000 |  |

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