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Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Equity |
Summary of Changes in Shareholders' Equity | The changes in shareholder’s equity for the three and six months ended June 30, 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | Additional |  | ​ | ​ |  | Total
​ | Common Stock |  | Paid- In |  | Accumulated |  | Shareholders’
​ | Shares |  | ​ | Amount |  | Capital |  | Deficit |  | Equity (Deficit)
Balance, December 31, 2018 | 33,265,629 | ​ | $ | 33 | ​ | $ | 428,729 | ​ | $ | (337,177) | ​ | $ | 91,585
Exercise of common stock options | 18,693 | ​ | ​ | — | ​ | ​ | 246 | ​ | ​ | — | ​ | ​ | 246
Issuance for employee stock purchase plan | 32,826 | ​ | ​ | — | ​ | ​ | 444 | ​ | ​ | — | ​ | ​ | 444
Vesting of restricted stock units ("RSUs") | 101,483 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs | (33,503) | ​ | ​ | — | ​ | ​ | (488) | ​ | ​ | — | ​ | ​ | (488)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 4,263 | ​ | ​ | — | ​ | ​ | 4,263
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (9,700) | ​ | ​ | (9,700)
Balance, March 31, 2019 | 33,385,128 | ​ | $ | 33 | ​ | $ | 433,194 | ​ | $ | (346,877) | ​ | $ | 86,350
Exercise of common stock options | 8,218 | ​ | ​ | — | ​ | ​ | 58 | ​ | ​ | — | ​ | ​ | 58
Vesting of RSUs | 26,304 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs | (3,097) | ​ | ​ | — | ​ | ​ | (35) | ​ | ​ | — | ​ | ​ | (35)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 4,162 | ​ | ​ | — | ​ | ​ | 4,162
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,712) | ​ | ​ | (4,712)
Balance, June 30, 2019 | 33,416,553 | ​ | $ | 33 | ​ | $ | 437,379 | ​ | $ | (351,589) | ​ | $ | 85,823
​ ​ The changes in shareholder’s equity for the three and six months ended June 30, 2018 ended were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ |  | Additional |  | ​ | ​ |  | Total
​ | Common Stock |  | Paid- In |  | Accumulated |  | Shareholders’
​ | Shares |  | ​ | Amount |  | Capital | ​ | Deficit |  | Equity (Deficit)
Balance, December 31, 2017 | 32,770,678 | ​ | $ | 33 | ​ | $ | 402,096 | ​ | $ | (298,049) | ​ | $ | 104,080
Exercise of common stock options | 183,987 | ​ | ​ | — | ​ | ​ | 2,373 | ​ | ​ | — | ​ | ​ | 2,373
Issuance for employee stock purchase plan | 50,151 | ​ | ​ | — | ​ | ​ | 510 | ​ | ​ | — | ​ | ​ | 510
Vesting of RSUs | 32,573 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs | (9,810) | ​ | ​ | — | ​ | ​ | (216) | ​ | ​ | — | ​ | ​ | (216)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 2,728 | ​ | ​ | — | ​ | ​ | 2,728
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (18,652) | ​ | ​ | (18,652)
Balance, March 31, 2018 | 33,027,579 | ​ | $ | 33 | ​ | $ | 407,491 | ​ | $ | (316,701) | ​ | $ | 90,823
Exercise of common stock options | 137,419 | ​ | ​ | — | ​ | ​ | 1,532 | ​ | ​ | — | ​ | ​ | 1,532
Vesting of RSUs | 20,887 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Shares withheld for employee taxes upon vesting of RSUs | (6,205) | ​ | ​ | — | ​ | ​ | (140) | ​ | ​ | — | ​ | ​ | (140)
Stock-based compensation | — | ​ | ​ | — | ​ | ​ | 3,526 | ​ | ​ | — | ​ | ​ | 3,526
Net loss | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (13,060) | ​ | ​ | (13,060)
Balance, June 30, 2018 | 33,179,680 | ​ | $ | 33 | ​ | $ | 412,409 | ​ | $ | (329,761) | ​ | $ | 82,681

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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