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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