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Borrowings (Details) - USD ($) $ in Thousands		9 Months Ended
	May 16, 2018	Sep. 30, 2018
Term Loans
Amount of term loan facility	$ 50,000
Net proceeds from the loan	$ 49,300	$ 49,292
Percentage of premium payable on redemption of the term loan	1.00%
Amount of fee payable upon closing of the term loan	$ 500
Exit fee (as a percent)	3.00%
Expiration term of exit fee	10 years
Minimum unrestricted cash and cash equivalents to be maintained	$ 50,000
Additional default interest rate	4.00%
Future debt payment obligations
2020		2,083
2021		25,000
2022		24,892
Total		51,975
Less: Unamortized discount and debt issuance costs		(1,144)
Less: Unaccreted value of final fee		(1,811)
Loan payable, long term		$ 49,020
At Maturity
Term Loans
Final payment fee (as a percent)	3.95%
Prior to first anniversary of closing date
Term Loans
Prepayment fee (as a percent)	3.00%
After first anniversary of closing date
Term Loans
Prepayment fee (as a percent)	2.00%
After second anniversary to maturity date
Term Loans
Prepayment fee (as a percent)	1.00%
LIBOR
Term Loans
Floating interest rate	7.45%

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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