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Equity - Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Balance at beginning of period | $ 86,350 | $ 91,585 | $ 90,823 | $ 104,080 | $ 91,585 | $ 104,080
Exercise of common stock options | 58 | 246 | 1,532 | 2,373 |  |
Exercise of common stock options, shares |  |  |  |  | 26,911 |
Issuance for employee stock purchase plan |  | 444 |  | 510 |  |
Issuance for employee stock purchase plan, shares |  |  |  |  | 32,826 |
Shares withheld for employee taxes upon vesting of RSUs | (35) | (488) | (140) | (216) |  |
Stock-based compensation expense | 4,162 | 4,263 | 3,526 | 2,728 |  |
Net loss | (4,712) | (9,700) | (13,060) | (18,652) | $ (14,412) | (31,712)
Balance at end of period | 85,823 | 86,350 | 82,681 | 90,823 | 85,823 | 82,681
Common Stock |  |  |  |  |  |
Balance at beginning of period | $ 33 | $ 33 | $ 33 | $ 33 | $ 33 | $ 33
Balance at beginning of year, shares | 33,385,128 | 33,265,629 | 33,027,579 | 32,770,678 | 33,265,629 | 32,770,678
Exercise of common stock options, shares | 8,218 | 18,693 | 137,419 | 183,987 |  |
Issuance for employee stock purchase plan, shares |  | 32,826 |  | 50,151 |  |
Vesting of restricted stock units, shares | 26,304 | 101,483 | 20,887 | 32,573 |  |
Shares withheld for employee taxes upon vesting of RSUs, shares | (3,097) | (33,503) | (6,205) | (9,810) |  |
Balance at end of period | $ 33 | $ 33 | $ 33 | $ 33 | $ 33 | $ 33
Balance at end of year, shares | 33,416,553 | 33,385,128 | 33,179,680 | 33,027,579 | 33,416,553 | 33,179,680
Additional Paid-In Capital |  |  |  |  |  |
Balance at beginning of period | $ 433,194 | $ 428,729 | $ 407,491 | $ 402,096 | $ 428,729 | $ 402,096
Exercise of common stock options | 58 | 246 | 1,532 | 2,373 |  |
Issuance for employee stock purchase plan |  | 444 |  | 510 |  |
Shares withheld for employee taxes upon vesting of RSUs | (35) | (488) | (140) | (216) |  |
Stock-based compensation expense | 4,162 | 4,263 | 3,526 | 2,728 |  |
Balance at end of period | 437,379 | 433,194 | 412,409 | 407,491 | 437,379 | 412,409
Accumulated Deficit |  |  |  |  |  |
Balance at beginning of period | (346,877) | (337,177) | (316,701) | (298,049) | (337,177) | (298,049)
Net loss | (4,712) | (9,700) | (13,060) | (18,652) |  |
Balance at end of period | $ (351,589) | $ (346,877) | $ (329,761) | $ (316,701) | $ (351,589) | $ (329,761)

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