Credit Facility (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 29, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jan. 31, 2016	Dec. 31, 2015
Line of Credit Facility
Additional debt issuance costs incurred	$ 124			$ 124	$ 0
Line of Credit
Line of Credit Facility
Amortization and interest expense capitalized		$ 227	$ 190	710	$ 436
Amortization and interest expense recorded		86		182
Amortization of debt issuance costs
Remainder of 2016				60
2017				241
2018				215
Amortization of debt issuance costs				$ 516
Line of Credit | Minimum
Line of Credit Facility
Interest rate percentage				3.00%
Line of Credit | Maximum
Line of Credit Facility
Interest rate percentage				3.60%
Line of Credit | LIBOR | Minimum
Line of Credit Facility
Spread on floating interest rate (as a percent)				2.50%
Line of Credit | LIBOR | Maximum
Line of Credit Facility
Spread on floating interest rate (as a percent)				3.50%
Line of Credit | Prime Rate | Minimum
Line of Credit Facility
Spread on floating interest rate (as a percent)				1.50%
Line of Credit | Prime Rate | Maximum
Line of Credit Facility
Spread on floating interest rate (as a percent)				2.50%
Revolving Line of Credit
Line of Credit Facility
Current issued borrowing capacity	$ 69,750	69,750		$ 69,750		$ 46,500
Maximum borrowing capacity with an option to increase the available amount upon the satisfaction of certain conditions		86,500		86,500
Outstanding balance		15,000		$ 15,000			$ 15,000
Revolving Line of Credit | Minimum
Line of Credit Facility
Fee on unused portion of Revolving Line of Credit (as a percent)				0.375%
Revolving Line of Credit | Maximum
Line of Credit Facility
Fee on unused portion of Revolving Line of Credit (as a percent)				0.50%
Term Loan
Line of Credit Facility
Current issued borrowing capacity		3,500		$ 3,500
Outstanding balance		$ 1,969		$ 1,969			$ 2,625
Term of the debt				4 years
Interest rate percentage		3.10%		3.10%
Principal payments of Term Loan
Remainder of 2016		$ 219		$ 219
2017		875		875
2018		875		875
Debt, Total		$ 1,969		$ 1,969