Description of Operations and Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Common stock, shares outstanding			12,897,001
Accumulated deficit	$ (192,407)	$ (192,407)	$ (168,771)
Debt extinguishment fee		$ 200
Class A Common Stock
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Net proceeds after deducting underwriting discounts and commissions and offering expenses	$ 99,100
Conversion ratio		100.00%
Common stock, shares outstanding	6,900,000	6,900,000
Class B Common Stock
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Conversion ratio	100.00%	100.00%
Common stock, shares outstanding	31,398,491	31,398,491
Common Stock Warrant | Class B Common Stock
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Conversion ratio	100.00%
Common Stock | Class B Common Stock
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Conversion ratio	100.00%
IPO
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Deferred offering costs	$ 3,600	$ 3,600
IPO | Class A Common Stock
Description Of Operations And Summary Of Significant Accounting Policies [Line Items]
Shares sold (in shares)	6,900,000
Share price (in dollars per share)	$ 16.00	$ 16.00