Notes Payable (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2014 USD ($)	Jun. 30, 2016 USD ($) item	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) tranche item	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Aug. 31, 2015 USD ($)
Notes Payable
Current portion of notes payable		$ 3,627		$ 3,627		$ 2,128
Interest Expense		$ 124	$ 117	$ 248	$ 232
Credit facility
Notes Payable
Proceeds from the issuance of debt	$ 2,000
Accrued interest rate (as a percent)	5.50%	6.50%		6.50%
Number of tranches | tranche				4
Available		$ 12,000		$ 12,000
Borrowed		7,000		$ 7,000
Monthly payments (as a percent)				4.166%
Current portion of notes payable		3,500		$ 3,500
Interest Expense		121		240
Accrued interest		$ 39		$ 39
Number of financial covenants associated with the term loans | item		0		0
Credit facility | Prime rate
Notes Payable
Variable interest rate	prime			prime
Variable rate basis (as a percent)	2.25%			3.25%
Term Loan Tranche A
Notes Payable
Available		$ 2,000		$ 2,000
Borrowed		2,000		2,000
Term Loan Tranche B
Notes Payable
Available		5,000		5,000
Borrowed		5,000		5,000
Term Loan Tranche C
Notes Payable
Available		2,500		2,500
Term Loan Tranche D
Notes Payable
Available		2,500		2,500
Vendor Debt
Notes Payable
Balance of outstanding loan		$ 127		$ 127			$ 584