Long - Term Loan, Net of Discount - Additional Information (Details) - Term Loan - USD ($)	1 Months Ended	9 Months Ended
	Jan. 31, 2015	Sep. 30, 2015
Line Of Credit Facility [Line Items]
Term loan agreement, maturity period	5 years
Line of credit facility, maximum borrowing capacity	$ 100,000,000
Line of credit facility, current borrowing capacity	$ 25,000,000
Line of credit facility, remaining borrowing capacity		$ 75,000,000
Interest on the outstanding loan		10.00%
Funding fees payable		1.50%
Prepayment fee percent		0.75%
Due date of outstanding principal loan		Jan. 31, 2020
Frequency of payments		Quarterly
Other Long-term Assets
Line Of Credit Facility [Line Items]
Total discount		$ 491,000
Additional deferred issuance costs		$ 1,739,000
First Year
Line Of Credit Facility [Line Items]
Prepayment fee percent		3.00%
Second Year
Line Of Credit Facility [Line Items]
Prepayment fee percent		2.00%
Third Year
Line Of Credit Facility [Line Items]
Prepayment fee percent		1.00%