Income Taxes - Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Effective income tax rate reconciliation
Tax benefit at U.S. federal statutory rate	$ (8,972)	$ (2,344)
Non-deductible interest expenses	410	749
Stock based compensation	407
Transaction Costs	256
Other Nondeductible Expenses	1
State income taxes benefit before valuation allowance, net of federal benefit	(1,491)	(309)
Increase in domestic valuation allowance	9,750	1,987
Research and development credit	(390)	$ (83)
Other adjustments	$ 29