Credit Facilities - Additional Information (Details) - USD ($)		1 Months Ended	6 Months Ended
	Aug. 11, 2015	Apr. 30, 2016	Jun. 30, 2017
Prior Term Loan Facility
Line Of Credit Facility [Line Items]
Credit facility, face amount	$ 50,000,000
Prior Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility, face amount	$ 25,000,000
2015 Credit Facility
Line Of Credit Facility [Line Items]
Description of interest rate			The Base Rate is equal to the higher of i) the Prime Rate, ii) the Federal Funds Effective rate plus 0.5%, or iii) the Eurodollar Rate plus 1.00%. The applicable margin on Base Rate and Eurodollar Rate loans is 3.00% and 4.00%, per annum, respectively.
2015 Credit Facility | Federal Funds Effective Rate
Line Of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
2015 Credit Facility | Eurodollar Rate
Line Of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Additional basis spread on variable rate	4.00%
Frequency of interest payment			Last day of the applicable interest period
2015 Credit Facility | Base Rate
Line Of Credit Facility [Line Items]
Additional basis spread on variable rate	3.00%
Frequency of interest payment			Quarterly
2015 Credit Facility | Term Loan Facility
Line Of Credit Facility [Line Items]
Credit facility, face amount	$ 55,000,000
Credit facility, increase amount		$ 15,000,000
2015 Credit Facility | Term Loan Facility | Eurodollar Rate
Line Of Credit Facility [Line Items]
Interest rate			5.15%
2015 Credit Facility | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility, face amount	$ 20,000,000