Annual report pursuant to Section 13 and 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
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Assets:      
Prepaid expenses and other current assets $ 368 $ 641 $ 272
Liabilities:      
Deferred revenue short-term 3,360 2,164  
Deferred revenue long-term 3,764 5,369  
Stockholders’ deficit:      
Accumulated deficit (123,604) (110,733) (111,820)
Before Adoption      
Assets:      
Prepaid expenses and other current assets 59   272
Liabilities:      
Deferred revenue short-term 3,565   2,629
Deferred revenue long-term 3,877   5,622
Stockholders’ deficit:      
Accumulated deficit (124,231)   $ (111,820)
Impact of Adoption      
Assets:      
Prepaid expenses and other current assets (309) 369  
Liabilities:      
Deferred revenue short-term 205 (465)  
Deferred revenue long-term 113 (253)  
Stockholders’ deficit:      
Accumulated deficit $ (627) $ 1,087