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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Events
Share price (in dollars per share)		$ 0.001
Additional common stock issued		$ 8,036	$ 11,994	$ 61,744
Common Stock
Subsequent Events
Number of shares issued		4,804,796	3,243,015	5,750,000
Additional common stock issued		$ 5	$ 3	$ 5
Second ATM Program | Common Stock | Subsequent Events
Subsequent Events
Number of shares issued	5,390,255
Share price (in dollars per share)	$ 1.59
Additional common stock issued	$ 8,600
Net proceeds	$ 8,300
Second ATM Program | Cowen | Common Stock | Subsequent Events
Subsequent Events
Number of shares issued	5,390,255
Share price (in dollars per share)	$ 1.59
Additional common stock issued	$ 8,600
Net proceeds	$ 8,300

X

- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 14
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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