Notes Payable (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2017	Mar. 31, 2017	Dec. 31, 2014
Notes Payable
Interest Expense		$ 84
Credit facility
Notes Payable
Proceeds from the issuance of debt			$ 7,000
Accrued interest rate (as a percent)			6.50%
Term loans balance paid in full	$ 3,500
Penalty for prepayment	$ 0
Interest Expense		$ 84
Credit facility | Prime rate
Notes Payable
Variable interest rate basis			prime rate
Spread on variable rate basis (as a percent)			3.25%