Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Stockholders' Equity At-the-Market Offering (Details) - USD ($)
$ in Thousands
Feb. 08, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
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   $ 77,600
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Number of shares authorized to be sold under equity distribution agreement (in shares) 35,000,000