Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity At-the-Market Offering (Details)

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Stockholders' Equity At-the-Market Offering (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
shares
Equity [Abstract]  
Number of shares authorized to be sold under equity distribution agreement (in shares) 10,000,000
Number of common shares issued under equity distribution agreement and outstanding as of period-end (in shares) 3,792,935
Accumulated proceeds from issuance of common shares under equity distribution agreement | $ $ 77,603