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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]    
Accounts receivable, allowance for credit loss, current $ 4,825 $ 5,201
Related party receivable, allowance for credit loss, current 1,509 2,312
Current portion of deferred revenue 2,800 5,697
Current portion of long-term debt, including $0 and $31,211 to related parties as of December 31, 2020 and 2019, respectively 360 31,670
Long-term debt, less current portion 171,522 186,321
Long-term portion of deferred revenue $ 23,023 $ 48,136
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 187,663,207 163,274,880
Common stock, shares outstanding (in shares) 187,663,207 163,274,880
Related Parties, Aggregated    
Related Party Transaction [Line Items]    
Current portion of deferred revenue $ 0 $ 877
Current portion of long-term debt, including $0 and $31,211 to related parties as of December 31, 2020 and 2019, respectively 0 31,211
Long-term debt, less current portion 0 25,000
Long-term portion of deferred revenue $ 21,205 $ 30,182