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Description of Business - Additional Information (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) Installment	Dec. 31, 2015 USD ($)	Jun. 13, 2016 USD ($)
Organization Consolidation and Presentation of Financial Statements [Line Items]
Net loss	$ 17,971,000	$ 14,704,000
Net cash used in operating activities	14,213,000	16,420,000
Accumulated deficit	$ 279,188,000	$ 261,217,000
Senior Secured Convertible Notes [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Debt instrument, original issuance date	Jun. 13, 2016
Debt instrument, principal face amount	$ 34,351,000		$ 35,000,000
Debt instrument payable number of equal installments | Installment	14

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Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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