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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Balance at period start (in shares) at Dec. 31, 2018 |  |  | 46,984 |  |  |
Balance at period start at Dec. 31, 2018 |  | $ 512,329 | $ 470 | $ 617,937 | $ (108,751) | $ 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock for business combination (in shares) |  |  | 2,364 |  |  |
Issuance of common stock for business combination |  | 36,980 | $ 23 | 36,957 |  |
Stock-based compensation (in shares) |  |  | 246 |  |  |
Stock-based compensation |  | 1,535 | $ 3 | 1,532 |  |
Purchase of common stock for retirement (in shares) |  |  | (44) |  |  |
Purchase of common stock for retirement |  | (734) |  | (734) |  |
Net loss |  | 61,092 |  |  | 61,092 |
Balance at period end (in shares) at Mar. 31, 2019 |  |  | 49,550 |  |  |
Balance at period end at Mar. 31, 2019 |  | 611,202 | $ 496 | 655,692 | (47,659) | 2,673
Balance at period start (in shares) at Dec. 31, 2018 |  |  | 46,984 |  |  |
Balance at period start at Dec. 31, 2018 |  | 512,329 | $ 470 | 617,937 | (108,751) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss |  | 5,370 |  |  |  |
Balance at period end (in shares) at Sep. 30, 2019 |  |  | 51,168 |  |  |
Balance at period end at Sep. 30, 2019 |  | 579,510 | $ 512 | 679,706 | (103,381) | 2,673
Balance at period start (in shares) at Mar. 31, 2019 |  |  | 49,550 |  |  |
Balance at period start at Mar. 31, 2019 |  | 611,202 | $ 496 | 655,692 | (47,659) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock for convertible notes repurchase, net (in shares) | [1] |  | 1,449 |  |  |
Issuance of common stock for convertible notes repurchase, net | [1] | 17,789 | $ 14 | 17,775 |  |
Issuance of common stock for employee stock purchase plan (in shares) |  |  | 37 |  |  |
Issuance of common stock for employee stock purchase plan |  | 754 |  | 754 |  |
Stock-based compensation (in shares) |  |  | (31) |  |  |
Stock-based compensation |  | 1,550 |  | 1,550 |  |
Purchase of common stock for retirement (in shares) |  |  | (2) |  |  |
Purchase of common stock for retirement |  | (20) |  | (20) |  |
Exercise of stock options (in shares) |  |  | 21 |  |  |
Exercise of stock options |  | 119 |  | 119 |  |
Net loss |  | 28,169 |  |  | 28,169 |
Balance at period end (in shares) at Jun. 30, 2019 |  |  | 51,024 |  |  |
Balance at period end at Jun. 30, 2019 |  | 659,563 | $ 510 | 675,870 | (19,490) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | (20) |  |  |
Stock-based compensation |  | 1,448 |  | 1,448 |  |
Purchase of common stock for retirement (in shares) |  |  | (6) |  |  |
Purchase of common stock for retirement |  | (414) |  | (414) |  |
Exercise of stock options (in shares) |  |  | 170 |  |  |
Exercise of stock options |  | 2,804 | $ 2 | 2,802 |  |
Net loss |  | (83,891) |  |  | (83,891) |
Balance at period end (in shares) at Sep. 30, 2019 |  |  | 51,168 |  |  |
Balance at period end at Sep. 30, 2019 |  | 579,510 | $ 512 | 679,706 | (103,381) | 2,673
Balance at period start (in shares) at Dec. 31, 2019 |  |  | 53,254 |  |  |
Balance at period start at Dec. 31, 2019 |  | 648,242 | $ 533 | 715,069 | (67,942) | 582
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | 296 |  |  |
Stock-based compensation |  | 1,615 | $ 3 | 1,612 |  |
Purchase of common stock for retirement (in shares) |  |  | (64) |  |  |
Purchase of common stock for retirement |  | (1,068) | $ (1) | (1,067) |  |
Exercise of stock options (in shares) |  |  | 351 |  |  |
Exercise of stock options |  | 3,936 | $ 3 | 3,933 |  |
Net loss |  | (222,337) |  |  | (222,337) |
Balance at period end (in shares) at Mar. 31, 2020 |  |  | 53,837 |  |  |
Balance at period end at Mar. 31, 2020 |  | 430,388 | $ 538 | 719,547 | (290,279) | 582
Balance at period start (in shares) at Dec. 31, 2019 |  |  | 53,254 |  |  |
Balance at period start at Dec. 31, 2019 |  | 648,242 | $ 533 | 715,069 | (67,942) | 582
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net loss |  | (277,168) |  |  |  |
Balance at period end (in shares) at Sep. 30, 2020 |  |  | 53,947 |  |  |
Balance at period end at Sep. 30, 2020 |  | 379,940 | $ 539 | 723,929 | (345,110) | 582
Balance at period start (in shares) at Mar. 31, 2020 |  |  | 53,837 |  |  |
Balance at period start at Mar. 31, 2020 |  | 430,388 | $ 538 | 719,547 | (290,279) | 582
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock for employee stock purchase plan (in shares) |  |  | 95 |  |  |
Issuance of common stock for employee stock purchase plan |  | 855 | $ 1 | 854 |  |
Stock-based compensation (in shares) |  |  | 10 |  |  |
Stock-based compensation |  | 1,794 |  | 1,794 |  |
Purchase of common stock for retirement |  | (1) |  | (1) |  |
Net loss |  | (40,560) |  |  | (40,560) |
Balance at period end (in shares) at Jun. 30, 2020 |  |  | 53,942 |  |  |
Balance at period end at Jun. 30, 2020 |  | 392,476 | $ 539 | 722,194 | (330,839) | 582
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | 10 |  |  |
Stock-based compensation |  | 1,777 | $ 0 | 1,777 | 0 | 0
Purchase of common stock for retirement (in shares) |  |  | (5) |  |  |
Purchase of common stock for retirement |  | (42) | $ 0 | (42) |  |
Net loss |  | (14,271) |  |  | (14,271) |
Balance at period end (in shares) at Sep. 30, 2020 |  |  | 53,947 |  |  |
Balance at period end at Sep. 30, 2020 |  | $ 379,940 | $ 539 | $ 723,929 | $ (345,110) | $ 582
[1] | The issuance of common stock for the repurchase of a portion of our 5.00% Convertible Senior Notes in the three months ended June 30, 2019 is presented net of a $12.3 million write-off associated with the equity component of the repurchased notes.

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