Significant Accounting Policies - Additional Information (Details)	12 Months Ended
Dec. 31, 2016 USD ($) Financial_Institution Segment $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Significant Accounting Policies [Line Items]
Number of operating segments \| Segment	1
Amount insured by FDIC	$ 250,000
Tax benefits recognized for stock-based compensation	0	$ 462,978	$ 0
Unrealized gain/(loss) on available-for-sale investments	111,000	(72,000)	(107,000)
Realized gains (losses) recognized from investment	0	0	$ 0
Interest or penalties accrued for uncertain tax positions	$ 0	0
Warrants exercise price (in dollars per share) \| $ / shares	$ 0.05
Convertible debt \| 2014 Notes
Significant Accounting Policies [Line Items]
Long-term debt, fair value	$ 209,600,000	$ 140,100,000
United States
Significant Accounting Policies [Line Items]
Number of financial institutions \| Financial_Institution	6
Europe
Significant Accounting Policies [Line Items]
Number of financial institutions \| Financial_Institution	2
Software and Software Development Costs
Significant Accounting Policies [Line Items]
Amortization period for capitalized software costs	3 years

Number Of Financial Institutions In Which Cash Deposited

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[Line Items] for Significant Accounting Policies [Table]

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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Exercise price per share or per unit of warrants or rights outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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