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Summary of Significant Accounting Policies - Intangible Assets, Bonus Accruals, and Revenue Recongition (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Impairment of intangible assets, indefinite-lived (excluding goodwill)										$ 0
Finite-lived Intangible Assets
Useful life									15 years
Finite-lived intangible assets, impairment									$ 0
Goodwill
Goodwill impairment									0	0
Revenue Recognition
Revenue recognized on an accrual basis									$ 47,099,000	$ 27,043,000	$ 12,545,000
Revenue recognized on accrual basis, percentage									72.00%	55.00%	33.00%
Revenue recognized on a cash basis									$ 17,986,000	$ 22,460,000	$ 25,645,000
Revenue recognized on a cash basis, percentage									28.00%	45.00%	67.00%
Total	$ 18,257,000	$ 18,603,000	$ 14,675,000	$ 13,550,000	$ 14,042,000	$ 12,335,000	$ 11,908,000	$ 11,218,000	$ 65,085,000	$ 49,503,000	$ 38,190,000
Total, Percent									100.00%	100.00%	100.00%
Net loss per common share, basic and diluted (in dollars per share)	$ (0.14)	$ (0.20)	$ (0.40)	$ (0.36)	$ (0.29)	$ (0.32)	$ (0.35)	$ (0.34)	$ (1.09)	$ (1.30)	$ (1.36)
Accrued Income Receivable
Revenue Recognition
Total		$ 3,500,000							$ 4,100,000	$ 700,000	$ 800,000
Net loss per common share, basic and diluted (in dollars per share)									$ 0.13	$ 0.03	$ 0.04
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property, plant and equipment, useful life (in years)									3 years
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Property, plant and equipment, useful life (in years)									5 years

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