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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Related Party Transaction [Line Items] |  |
Current portion of deferred revenue | $ 17,149 | $ 15,554
Long-term portion of deferred revenue | 54,042 | 54,210
Long-term debt, less current portion | $ 214,010 | $ 211,235
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares issued | 160,615,416 | 160,020,466
Common stock, shares outstanding | 160,615,416 | 160,020,466
Related Parties, Aggregated |  |
Related Party Transaction [Line Items] |  |
Current portion of deferred revenue | $ 8,024 | $ 6,945
Long-term portion of deferred revenue | 50,620 | 52,227
Long-term debt, less current portion | $ 55,515 | $ 55,290

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