Description of Operations and Summary of Significant Accounting Policies - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Apr. 30, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 42,007		$ 17,256
Restricted cash	0	$ 2,500	2,500
Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows	$ 42,007		$ 19,756	$ 22,271	$ 38,316