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Preferred Redeemable Convertible Stock - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 17, 2016 | Jun. 30, 2012 | Jun. 30, 2009 | Mar. 31, 2008 | Feb. 28, 2007 | Feb. 28, 2006 | Jun. 30, 2005 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Outstanding convertible promissory notes and accrued interest |  | $ 7.1 |  |  |  |  |  |  |  |
Common stock, offering price per share |  |  |  |  |  |  |  | $ 76.80 |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued |  |  |  |  |  |  |  |  | 127,143 |
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 |  |  |
Gross proceeds from sale of convertible preferred stock |  |  |  |  |  | $ 8.8 | $ 8.8 |  |  |
Conversion of preferred stock to common stock, conversion price |  |  |  |  |  |  |  | 11.11 |  |
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 |  |  |  |  |
Gross proceeds from sale of convertible preferred stock |  |  |  |  | $ 6.2 |  |  |  |  |
Conversion of preferred stock to common stock, conversion price |  |  |  |  |  |  |  | 13.00 |  |
Series G Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred convertible stock sold, per share |  |  | $ 1.30 | $ 1.30 |  |  |  |  |  |
Gross proceeds from sale of convertible preferred stock |  |  | $ 4.3 | $ 4.3 |  |  |  |  |  |
Preferred stock, shares issued upon conversion |  |  | 463,856 | 6,216,607 |  |  |  |  |  |
Preferred stock, conversion price per share |  |  | $ 1.30 | $ 1.04 |  |  |  |  |  |
Conversion of preferred stock to common stock, conversion price |  |  |  |  |  |  |  | $ 13.00 |  |
Senior Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Dividend rate, percentage |  |  |  |  |  |  |  | 8.00% |  |
Preferred convertible stock, shares outstanding |  |  |  |  |  |  |  | 4,875,000 |  |
Preferred stock ownership percentage |  |  |  |  |  |  |  | 50.00% |  |
Firm Commitment | Common Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate proceeds from issuance of private placement |  |  |  |  |  |  |  | $ 15.0 |  |
Common stock, offering price per share |  |  |  |  |  |  |  | $ 76.80 |  |
Preferred Redeemable Convertible Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred convertible stock, shares outstanding |  |  |  |  |  |  |  |  |  | 23,271,702
Conversion of stock, shares issued |  |  |  |  |  |  |  |  | (23,271,702) |
Preferred Redeemable Convertible Stock | IPO |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion of stock, shares converted | 23,271,702 |  |  |  |  |  |  |  |  |
Conversion of stock, shares issued | 2,327,122 |  |  |  |  |  |  |  |  |
Preferred stock dividends converted into common stock | 1,451,631 |  |  |  |  |  |  |  |  |

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