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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

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