Stock-Based Compensation - Additional Information (Detail) |
9 Months Ended | ||
---|---|---|---|
Sep. 30, 2018
USD ($)
Period
$ / shares
shares
|
Sep. 30, 2017
shares
|
Apr. 28, 2015
shares
|
|
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Cash proceeds from exercises of stock options | $ | $ 396,000 | ||
Option exercises | 171,567 | 0 | |
Weighted average fair value of stock options granted to employees | $ / shares | $ 4.11 | ||
Excess tax benefit from stock-based awards | $ | $ 0 | ||
2014 Plan [Member] | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Number of shares of common stock reserved for issuance | 1,527,770 | ||
Additional number of shares of common stock reserved for issuance | 2,321,363 | ||
Common stock reserved for issuance, description | Initially, a total of 1,527,770 shares of the Company’s common stock were reserved for issuance pursuant to the 2014 Plan, which number is also the limit on shares of common stock available for awards of incentive stock options. The number of shares available for issuance under the 2014 Plan will, unless otherwise determined by the Company’s Board of Directors or the Compensation Committee, be automatically increased on January 1st of each year commencing on January 1, 2016 and ending on (and including) January 1, 2024, in an amount equal to 3.5% of the total number of shares of the Company’s common stock outstanding on December 31st of the preceding calendar year. | ||
Percentage of common stock outstanding to increase shares reserved for issuance | 3.50% | ||
2014 ESPP [Member] | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Number of shares of common stock reserved for issuance | 458,331 | ||
Additional number of shares of common stock reserved for issuance | 663,246 | ||
Common stock reserved for issuance, description | The number of shares available for issuance under the ESPP will, unless otherwise determined by the Company’s Board of Directors or the Compensation Committee, be automatically increased on January 1st of each year commencing on January 1, 2016 and ending on (and including) January 1, 2024, in an amount equal to 1% of the total number of shares of the Company’s common stock outstanding on December 31st of the preceding calendar year. | ||
Percentage of common stock outstanding to increase shares reserved for issuance | 1.00% | ||
Duration of employee stock purchase plan as determined by the compensation committee | 24 months | ||
Duration for offering period, employee stock purchase plan | 6 months | ||
Employee stock purchase plan, number of purchase periods | Period | 4 | ||
Maximum duration for purchase under employee stock purchase plan | 1 year | ||
Maximum duration of employee stock purchase plan | 27 months | ||
Percentage of purchase of common stock | 85.00% | ||
Percentage of common stock on the date of purchase | 85.00% |