Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Condensed Consolidated Balance Sheet Line Items (Details)

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Summary of Significant Accounting Policies - Condensed Consolidated Balance Sheet Line Items (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets:      
Prepaid expenses and other current assets $ 740 $ 641 $ 272
Liabilities:      
Deferred revenue short-term 2,101 2,164 2,629
Deferred revenue long-term 5,048 5,369 5,622
Stockholders’ deficit:      
Accumulated deficit (117,294) (110,733) (111,820)
Balance at December 31, 2018      
Assets:      
Prepaid expenses and other current assets 366   272
Liabilities:      
Deferred revenue short-term 2,319   2,629
Deferred revenue long-term 5,257   5,622
Stockholders’ deficit:      
Accumulated deficit (118,095)   $ (111,820)
Adjustments due to ASU 2014-09      
Assets:      
Prepaid expenses and other current assets (374) 369  
Liabilities:      
Deferred revenue short-term 218 (465)  
Deferred revenue long-term 209 (253)  
Stockholders’ deficit:      
Accumulated deficit $ (801) $ 1,087