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Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands | Total | Redeemable Convertible Preferred Stock [Member] | Series B Preferred Stock [Member] | Series C Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Other Comprehensive Loss [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 |  | $ 9,122 |  |  |  |  |  |
Balance, Shares at Dec. 31, 2013 |  | 24,037,500 |  |  |  |  |  |
Issuance of Series B redeemable convertible preferred stock |  |  | $ 9,000 |  |  |  |  |
Issuance of Series B redeemable convertible preferred stock, Shares |  |  | 18,000,000 |  |  |  |  |
Settlement of fair value of redeemable convertible preferred stock tranche liability |  |  | $ 2,308 |  |  |  |  |
Accretion of redemption of convertible preferred stock to redemption value | $ 146 | $ 146 |  |  |  |  |  |
Balance at Dec. 31, 2014 |  | $ 20,576 |  |  |  |  |  |
Balance, Shares at Dec. 31, 2014 |  | 42,037,500 |  |  |  |  |  |
Balance at Dec. 31, 2013 | (1,394) |  |  |  |  | $ 135 | $ (46) | $ (1,483)
Balance, Shares at Dec. 31, 2013 |  |  |  |  | 226,009 |  |  |
Accretion of redeemable convertible preferred stock to redemption value | (146) |  |  |  |  | (143) |  | (3)
Stock-based compensation expense | 42 |  |  |  |  | 42 |  |
Issuance of common stock upon the exercise of options | 3 |  |  |  |  | 3 |  |
Issuance of common stock upon the exercise of options, Shares |  |  |  |  | 2,548 |  |  |
Other comprehensive loss | (54) |  |  |  |  |  | (54) |
Net loss | (11,072) |  |  |  |  |  |  | (11,072)
Balance at Dec. 31, 2014 | (12,621) |  |  |  |  | 37 | (100) | (12,558)
Balance, Shares at Dec. 31, 2014 |  |  |  |  | 228,557 |  |  |
Issuance of Series B redeemable convertible preferred stock |  |  |  | $ 16,345 |  |  |  |
Issuance of Series B redeemable convertible preferred stock, Shares |  |  |  | 35,147,617 |  |  |  |
Accretion of redemption of convertible preferred stock to redemption value | 75 | $ 75 |  |  |  |  |  |
Balance at Dec. 31, 2015 | $ 36,996 | $ 36,996 |  |  |  |  |  |
Balance, Shares at Dec. 31, 2015 | 77,185,117 | 77,185,117 |  |  |  |  |  |
Accretion of redeemable convertible preferred stock to redemption value | $ (75) |  |  |  |  | (75) |  |
Stock-based compensation expense | 99 |  |  |  |  | 99 |  |
Issuance of common stock upon the exercise of options | 57 |  |  |  |  | 57 |  |
Issuance of common stock upon the exercise of options, Shares |  |  |  |  | 43,852 |  |  |
Other comprehensive loss | (2) |  |  |  |  |  | (2) |
Net loss | (14,858) |  |  |  |  |  |  | (14,858)
Balance at Dec. 31, 2015 | $ (27,400) |  |  |  |  | 118 | (102) | (27,416)
Balance, Shares at Dec. 31, 2015 | 272,409 |  |  |  | 272,409 |  |  |
Exercise of redeemable convertible preferred stock warrant liability |  | $ 1,025 |  |  |  |  |  |
Exercise of redeemable convertible preferred stock warrant liability, Shares |  | 1,999,998 |  |  |  |  |  |
Issuance of Series B redeemable convertible preferred stock |  |  |  | $ 22,488 |  |  |  |
Issuance of Series B redeemable convertible preferred stock, Shares |  |  |  | 45,189,794 |  |  |  |
Settlement of fair value of redeemable convertible preferred stock tranche liability | $ 5,837 |  |  |  |  |  |  |
Accretion of redemption of convertible preferred stock to redemption value | $ 558 | $ 558 |  |  |  |  |  |
Balance, Shares at Dec. 31, 2016 | 0 |  |  |  |  |  |  |
Accretion of redeemable convertible preferred stock to redemption value | $ (558) |  |  |  |  | (558) |  |
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering | 66,904 | $ (66,904) |  |  |  | 66,904 |  |
Conversion of redeemable convertible preferred stock to common stock at closing of initial public offering, Shares |  | (124,374,909) |  |  | 8,577,571 |  |  |
Issuance of common stock upon initial public offering, net of issuance costs | 83,648 |  |  |  |  | 83,648 |  |
Issuance of common stock upon initial public offering, net of issuance costs, Shares |  |  |  |  | 7,752,972 |  |  |
Stock-based compensation expense | 2,130 |  |  |  |  | 2,130 |  |
Issuance of common stock upon the exercise of options | 151 |  |  |  |  | 151 |  |
Issuance of common stock upon the exercise of options, Shares |  |  |  |  | 119,328 |  |  |
Other comprehensive loss | (143) |  |  |  |  |  | (143) |
Net loss | (37,177) |  |  |  |  |  |  | (37,177)
Balance at Dec. 31, 2016 | $ 87,555 |  |  |  |  | $ 152,393 | $ (245) | $ (64,593)
Balance, Shares at Dec. 31, 2016 | 16,722,280 |  |  |  | 16,722,280 |  |  |

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