Stockholders' Equity - Private Investment (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
Sep. 21, 2016	Dec. 31, 2016
Stock Purchase Agreement
Proceeds from private investment in public equity		$ 39,723
Stock sale agreement \| Private Placement
Stock Purchase Agreement
Number of shares sold	6,055,341
Sale price of stock (in dollars per share)	$ 6.56
Proceeds from private investment in public equity	$ 39,700
Ownership percentage (as a percent)	19.90%

Number of new stock issued during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
-Article 5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration