Notes Payable (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) item	Mar. 31, 2016 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)
Notes Payable
Current portion of notes payable	$ 3,500,000			$ 3,500,000
Interest Expense	$ 84,000	$ 124,000
Credit facility
Notes Payable
Proceeds from the issuance of debt			$ 7,000,000
Accrued interest rate (as a percent)	6.50%
Borrowed	$ 4,400,000
Monthly payments (as a percent)	4.166%
Current portion of notes payable	$ 3,500,000
Interest Expense	84,000	$ 119,000.000
Accrued interest	$ 27,000
Number of financial covenants associated with the term loans | item	0
Credit facility | Prime rate
Notes Payable
Variable interest rate	prime
Variable rate basis (as a percent)	3.25%