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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 17, 2016 | Nov. 30, 2003 | Sep. 30, 2003 | Mar. 31, 2001 | Jun. 30, 2000 | Dec. 31, 2018 | Dec. 31, 2003 | Jun. 30, 2009 | Mar. 31, 2008 | Feb. 28, 2007 | Feb. 28, 2006 | Jun. 30, 2005
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  |  |  |  |  | $ 15.0 |  |  |  |  |  |
Offering price per share |  |  |  |  |  | $ 76.80 |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares issued |  |  |  |  | 313,500 |  |  |  |  |  |  |
Preferred convertible stock sold, per share |  |  |  |  | $ 3.84 |  |  |  |  |  |  |
Proceeds from sale of preferred convertible stock, gross |  |  |  |  | $ 1.2 |  |  |  |  |  |  |
Preferred stock annual dividend rate per share |  |  |  |  |  | 0.0488 |  |  |  |  |  |
Preferred stock, liquidation preference per share |  |  |  |  |  | 19.20 |  |  |  |  |  |
Convertible preferred stock conversion price per share |  |  |  |  |  | 21.70 |  |  |  |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares issued |  |  |  | 290,993 |  |  |  |  |  |  |  |
Preferred convertible stock sold, per share |  |  |  | $ 4.39 |  |  |  |  |  |  |  |
Proceeds from sale of preferred convertible stock, gross |  |  |  | $ 1.3 |  |  |  |  |  |  |  |
Additional number of shares issued for services and to satisfy debt obligation |  |  |  |  |  |  | 866,613 |  |  |  |  |
Proceed from issuance of additional stock |  |  |  |  |  |  | $ 1.2 |  |  |  |  |
Preferred stock annual dividend rate per share |  |  |  |  |  | 0.00 |  |  |  |  |  |
Convertible preferred stock conversion price per share |  |  |  |  |  | 24.23 |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares issued |  |  | 682,000 |  |  |  |  |  |  |  |  |
Preferred convertible stock sold, per share |  |  | $ 1.00 |  |  |  |  |  |  |  |  |
Proceeds from sale of preferred convertible stock, gross |  |  | $ 0.7 |  |  |  |  |  |  |  |  |
Preferred stock annual dividend rate per share |  |  |  |  |  | 0.00 |  |  |  |  |  |
Convertible preferred stock conversion price per share |  |  |  |  |  | 8.59 |  |  |  |  |  |
Series D Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares issued |  | 4,091,068 |  |  |  |  |  |  |  |  |  |
Preferred convertible stock sold, per share |  | $ 0.542 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of preferred convertible stock, gross |  | $ 2.2 |  |  |  |  |  |  |  |  |  |
Preferred stock annual dividend rate per share |  |  |  |  |  | 0.0488 |  |  |  |  |  |
Preferred stock, liquidation preference per share |  |  |  |  |  | 2.168 |  |  |  |  |  |
Convertible preferred stock conversion price per share |  |  |  |  |  | 5.42 |  |  |  |  |  |
Series E Preferred Redeemable Convertible Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares issued |  |  |  |  |  |  |  |  |  |  | 7,984,727 | 7,984,727
Preferred convertible stock sold, per share |  |  |  |  |  |  |  |  |  |  | $ 1.11 | $ 1.11
Preferred stock, liquidation preference per share |  |  |  |  |  | 4.44 |  |  |  |  |  |
Series F Preferred Redeemable Convertible Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares issued |  |  |  |  |  |  |  |  |  | 4,734,374 |  |
Preferred convertible stock sold, per share |  |  |  |  |  |  |  |  |  | $ 1.30 |  |
Preferred stock, liquidation preference per share |  |  |  |  |  | 5.20 |  |  |  |  |  |
Series G Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock sold, per share |  |  |  |  |  |  |  | $ 1.30 | $ 1.30 |  |  |
Preferred stock, liquidation preference per share |  |  |  |  |  | $ 5.20 |  |  |  |  |  |
Junior Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares outstanding |  |  |  |  |  | 1,678,450 |  |  |  |  |  |
Preferred stock ownership percentage |  |  |  |  |  | 50.00% |  |  |  |  |  |
Preferred Convertible Stock | IPO |  |  |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares converted | 6,244,174 |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued | 753,611 |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividends converted into common stock | 505,576 |  |  |  |  |  |  |  |  |  |  |

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