Notes Payable (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2017	Sep. 30, 2017	Sep. 30, 2017	Dec. 31, 2014
Notes Payable
Interest Expense		$ 3	$ 159
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		3	159
Accrued interest		$ 0	$ 0
Credit facility | Prime rate
Notes Payable
Variable interest rate basis				prime rate
Spread on variable rate basis (as a percent)				3.25%