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Stockholders' Equity - Summary of Stock Options Outstanding (Detail) | 12 Months Ended
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Dec. 31, 2018 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 8,726,092
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 7 years 4 months 6 days
Options Exercisable Number of Shares of common stock subject to options | shares | 3,699,150
Options Exercisable Weighted Average Exercise Price | $ 9
$2.55 – $3.20 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 2.55
Upper Range of Exercise Price | $ 3.20
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 352,920
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 7 years 6 months 21 days
Options Exercisable Number of Shares of common stock subject to options | shares | 91,772
Options Exercisable Weighted Average Exercise Price | $ 3
$3.50 – $3.50 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 3.50
Upper Range of Exercise Price | $ 3.50
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,171,546
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years
Options Exercisable Number of Shares of common stock subject to options | shares | 520,209
Options Exercisable Weighted Average Exercise Price | $ 4
$3.55 – $5.70 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 3.55
Upper Range of Exercise Price | $ 5.70
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 894,224
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 5 years 21 days
Options Exercisable Number of Shares of common stock subject to options | shares | 589,511
Options Exercisable Weighted Average Exercise Price | $ 5
$5.72 – $7.20 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 5.72
Upper Range of Exercise Price | $ 7.20
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 915,176
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 7 years 5 months 1 day
Options Exercisable Number of Shares of common stock subject to options | shares | 610,840
Options Exercisable Weighted Average Exercise Price | $ 7
$7.70 – $9.99 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 7.70
Upper Range of Exercise Price | $ 9.99
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 897,995
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 2 months 4 days
Options Exercisable Number of Shares of common stock subject to options | shares | 566,601
Options Exercisable Weighted Average Exercise Price | $ 9
$10.16 – $12.72 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 10.16
Upper Range of Exercise Price | $ 12.72
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 936,327
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 10 months 28 days
Options Exercisable Number of Shares of common stock subject to options | shares | 403,714
Options Exercisable Weighted Average Exercise Price | $ 12
$12.80 – $15.00 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 12.80
Upper Range of Exercise Price | $ 15.00
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,213,226
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 6 years 4 months 13 days
Options Exercisable Number of Shares of common stock subject to options | shares | 694,173
Options Exercisable Weighted Average Exercise Price | $ 14
$15.11 – $19.80 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 15.11
Upper Range of Exercise Price | $ 19.80
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 758,250
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 8 years 8 months 26 days
Options Exercisable Number of Shares of common stock subject to options | shares | 216,830
Options Exercisable Weighted Average Exercise Price | $ 16
$20.05 – $20.05 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | 20.05
Upper Range of Exercise Price | $ 20.05
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 1,003,728
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 9 years 21 days
$20.85 – $24.95 [Member] |
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Lower Range of Exercise Price | $ 20.85
Upper Range of Exercise Price | $ 24.95
Options Outstanding and Exercisable Number of Shares of common stock subject to options | shares | 582,700
Options Outstanding and Exercisable Weighted Average Remaining Contractual Life (In years) | 9 years 29 days
Options Exercisable Number of Shares of common stock subject to options | shares | 5,500
Options Exercisable Weighted Average Exercise Price | $ 21

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- Definition The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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