Stockholders Equity - Additional Information (Details) $ / shares in Units, $ in Thousands		6 Months Ended
	Jun. 14, 2017 USD ($) shares	Jun. 30, 2017 USD ($) Plan $ / shares shares	Jun. 30, 2016 $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares
Class Of Stock [Line Items]
Common stock, shares authorized		250,000,000	250,000,000	250,000,000
Common stock, par value | $ / shares		$ 0.001	$ 0.001	$ 0.001
Common stock, voting rights		one vote per share
Purchase of shares of common stock		16,000
Costs incurred in raising equity | $	$ 11,700	$ 9,044
Number of stock option plans | Plan		3
2013, 2007 and 2004 Plans | Maximum
Class Of Stock [Line Items]
Common stock options authorized grant		11,800,000
2017 Plans
Class Of Stock [Line Items]
Common stock reserved for future issuance		5,200,000
Shares issued		0
Common Stock
Class Of Stock [Line Items]
Sale of common stock, shares		6,900,000	1,133,332
Convertible Bonds | Common Stock
Class Of Stock [Line Items]
Shares issued upon conversion	7,727,273
IPO
Class Of Stock [Line Items]
Sale of common stock, shares		6,900,000
Common stock share price | $ / shares		$ 11.00
Shares from the exercise of warrants and options		406,386
Vesting of restricted stock units and grant of shares		791,982
Cumulative increase to equity shares value | $		$ 164,700
Costs incurred in raising equity | $		$ 11,700
IPO | 2017 Plans
Class Of Stock [Line Items]
Common stock reserved for future issuance		1,000,000
IPO | Other Long-term Assets [Member]
Class Of Stock [Line Items]
Deferred costs | $				$ 1,800
IPO | Licensing Agreements
Class Of Stock [Line Items]
Sale of common stock, shares		568,182
IPO | Common Stock
Class Of Stock [Line Items]
Common stock share price | $ / shares		$ 11.00
IPO | Convertible Bonds | Common Stock
Class Of Stock [Line Items]
Shares issued upon conversion		7,727,273