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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive income (loss) | GENBAND | GENBAND Common stock | GENBAND Additional paid-in capital | Edgewater Networks, Inc. | Edgewater Networks, Inc. Common stock | Edgewater Networks, Inc. Additional paid-in capital | Anova Data, Inc. | Anova Data, Inc. Additional paid-in capital
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Balance (in shares) at Dec. 31, 2016 |  | 49,041,881 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2016 | $ 219,122 | $ 49 | $ 1,250,744 | $ (1,037,174) | $ 5,503 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with employee stock purchase plan (in shares) |  | 249,621 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 1,252 |  | 1,252 |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 105,688 |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 617 |  | 617 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock awards and units (in shares) |  | 2,160,553 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock awards and units | 0 |  |  |  |  |  |  |  |  |  |  |  |
Vesting of performance-based stock awards and units (in shares) |  | 145,357 |  |  |  |  |  |  |  |  |  |  |
Vesting of performance-based stock awards and units | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares) |  | (807,952) |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations | (7,523) |  | (7,523) |  |  |  |  |  |  |  |  |  |
Shares issued as consideration in connection with acquisition (in shares) |  |  |  |  |  | 50,857,708 |  |  |  |  |  |  |
Shares issued as consideration in connection with acquisition |  |  |  |  |  | $ 413,982 | $ 5 | $ 413,977 |  |  |  |  |
Reclassification between Common stock and Additional paid-in capital to record change in par value of common stock | 0 | $ (44) | 44 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 25,657 |  | 25,657 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (2,434) |  |  |  | (2,434) |  |  |  |  |  |  |  |
Net loss | (35,252) |  |  | (35,252) |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  | 101,752,856 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2017 | 615,421 | $ 10 | 1,684,768 | (1,072,426) | 3,069 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 15,935 |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 73 |  | 73 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock awards and units (in shares) |  | 1,278,062 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock awards and units | 0 |  |  |  |  |  |  |  |  |  |  |  |
Vesting of performance-based stock awards and units (in shares) |  | 57,768 |  |  |  |  |  |  |  |  |  |  |
Vesting of performance-based stock awards and units | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares) |  | (524,516) |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations | (2,024) |  | (2,024) |  |  |  |  |  |  |  |  |  |
Shares issued as consideration in connection with acquisition (in shares) |  |  |  |  |  |  |  |  | 4,235,531 |  |  |  |
Shares issued as consideration in connection with acquisition |  |  |  |  |  |  |  |  | $ 30,000 | $ 1 | $ 29,999 |  |
Assumption of equity awards in connection with acquisition of Edgewater Networks, Inc. |  |  |  |  |  |  |  |  | $ 747 |  | $ 747 |  |
Stock-based compensation expense | 10,013 |  | 10,013 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 634 |  |  |  | 634 |  |  |  |  |  |  |  |
Net loss | $ (76,810) |  |  | (76,810) |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2018 | 106,815,636 | 106,815,636 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2018 | $ 590,298 | $ 11 | 1,723,576 | (1,136,992) | 3,703 |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with employee stock purchase plan (in shares) |  | 282,646 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with employee stock purchase plan | 863 |  | 863 |  |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  | 127,334 |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options | 235 |  | 235 |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock awards and units (in shares) |  | 1,504,707 |  |  |  |  |  |  |  |  |  |  |
Vesting of restricted stock awards and units | 0 |  |  |  |  |  |  |  |  |  |  |  |
Vesting of performance-based stock awards and units (in shares) |  | 9,466 |  |  |  |  |  |  |  |  |  |  |
Vesting of performance-based stock awards and units | 0 |  |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations (in shares) |  | (240,673) |  |  |  |  |  |  |  |  |  |  |
Shares of restricted stock returned to the Company under net share settlements to satisfy tax withholding obligations | (1,193) |  | (1,193) |  |  |  |  |  |  |  |  |  |
Shares issued as consideration in connection with acquisition (in shares) |  |  |  |  |  |  |  |  |  |  |  | 2,948,793 |
Shares issued as consideration in connection with acquisition |  |  |  |  |  |  |  |  |  |  |  | $ 15,186 | $ 15,186
Repurchase and retirement of common stock (in shares) |  | (975,914) |  |  |  |  |  |  |  |  |  |  |
Repurchase and retirement of common stock | (4,536) |  | (4,536) |  |  |  |  |  |  |  |  |  |
Reclassification of liability to equity for bonuses converted to stock awards | 1,052 |  | 1,052 |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | 12,601 |  | 12,601 |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (1,176) |  |  |  | (1,176) |  |  |  |  |  |  |  |
Net loss | $ (130,075) |  |  | (130,075) |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2019 | 110,471,995 | 110,471,995 |  |  |  |  |  |  |  |  |  |  |
Balance at Dec. 31, 2019 | $ 483,255 | $ 11 | $ 1,747,784 | $ (1,267,067) | $ 2,527 |  |  |  |  |  |  |  |

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