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Net Loss Per Share - Summary of Antidilutive Securities Excluded From Computation Diluted Weighted Average Shares Outstanding (Detail) - shares | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share amount | 7,417,186 | 6,300,712
Unvested Restricted Stock [Member] |  |
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share amount | 420,541 | 811,681
Unvested Restricted Stock Units [Member] |  |
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share amount | 1,878,730 | 619,240
Employee Stock Purchase Plan [Member] |  |
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share amount | 76,647 | 103,471
Options to Purchase Common Stock [Member] |  |
Schedule Of Calculation Of Numerator And Denominator In Earnings Per Share [Line Items] |  |
Antidilutive securities excluded from computation of earnings per share amount | 5,041,268 | 4,766,320

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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