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Fair Value Measurements - Assets Measured on a Recurring Basis (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	$ 35,656	$ 46,985
Fair value of liabilities	6,601
Warrant liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities	6,601
Cash on deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	9,767	46,935
Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	25,889	50
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	35,656	46,985
Fair value of liabilities	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Warrant liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash on deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	9,767	46,935
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	25,889	50
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	0	0
Fair value of liabilities	0
Significant Other Observable Inputs (Level 2) | Warrant liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities	0
Significant Other Observable Inputs (Level 2) | Cash on deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	0	0
Significant Other Observable Inputs (Level 2) | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents		0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	0	0
Fair value of liabilities	6,601
Significant Unobservable Inputs (Level 3) | Warrant liability
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of liabilities	6,601
Significant Unobservable Inputs (Level 3) | Cash on deposit
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents	$ 0	0
Significant Unobservable Inputs (Level 3) | Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of cash equivalents		$ 0

X

- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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