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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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