Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017 USD ($) bank segment	Jan. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Number of reportable segments | segment	1
Number of banks utilized for diversification of funds (in banks) | bank	3
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	$ 96,814		$ 51,292	$ 49,378	$ 51,744
Accounting Standards Update 2016-18 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents		$ 60	$ 60	$ 60	$ 60
Retained Earnings | Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative decrease in accumulated deficit as a result of a change in accounting policy		$ 41