Stock-Based Compensation - Additional Information (Detail)	1 Months Ended					12 Months Ended			24 Months Ended	36 Months Ended	48 Months Ended
	Jan. 31, 2023 Milestone shares	Jan. 31, 2022 Milestone shares	Jan. 31, 2021 Milestone shares	Jan. 31, 2020 Milestone shares	Jan. 31, 2019 Milestone shares	Dec. 31, 2023 USD ($) Milestone Period $ / shares shares	Dec. 31, 2022 USD ($) Milestone $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) Milestone shares	Dec. 31, 2023 USD ($) Milestone shares	Dec. 31, 2023 USD ($) Milestone shares	Dec. 31, 2022 USD ($) Milestone	Apr. 28, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance | shares						18,882,215			18,882,215	18,882,215	18,882,215
Stock-based compensation | $						$ 16,750,000	$ 8,673,000	$ 6,100,000
Forfeited awards | shares						0	30,000	132,745
Cash proceeds from exercises of stock options | $						$ 6,400,000	$ 0	$ 351,000
Total fair value of stock options, vested | $						$ 4,000,000	$ 3,200,000	$ 2,900,000
Weighted average fair value of stock options granted to employees | $ / shares						$ 6.76	$ 3.5	$ 4.16
Excess tax benefit from stock-based awards | $						$ 0
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Milestone achievement period	4 years	4 years	4 years	4 years	4 years
Issuance of performance based award | shares	920,000	657,000	205,500	244,000	221,600
Percentage of shares vested upon achievement of certain milestone				100.00%	100.00%
Number of milestones to be achieve | Milestone				3	3
Forfeited awards | shares							40,000
Number of milestones achieved | Milestone							3					3
Performance Based Restricted Stock Units [Member] | PRSU Awards Vesting Upon the Achievement of Three of the Milestones Over a Four Year Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested upon achievement of certain milestone	100.00%	100.00%	100.00%
Number of milestones to be achieve | Milestone	3	3	3
Performance Based Restricted Stock Units [Member] | PRSU Awards Vesting Upon the Achievement of Four of the Milestones Over a Four Year Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested upon achievement of certain milestone			133.30%
Number of milestones to be achieve | Milestone			4
Performance Based Restricted Stock Units [Member] | PRSU Awards Vesting Upon the Achievement of All Four of the Milestones Over a Four Year Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares vested upon achievement of certain milestone	133.30%	133.30%
Number of milestones to be achieve | Milestone	4	4
Performance Based Restricted Stock Units [Member] | January 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $												$ 1,400,000
Performance Based Restricted Stock Units [Member] | January 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $						$ (454,000)					$ 1,200,000
Number of milestones achieved | Milestone						2			2	2	2
Number of milestones deemed as achievable | Milestone						1			1	1	1
Forfeiture of performance based award | shares						10,500
Performance Based Restricted Stock Units [Member] | January 2021 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $						$ 64,000				$ 1,000,000
Number of milestones achieved | Milestone						1			1	1	1
Number of milestones deemed as achievable | Milestone						2			2	2	2
Forfeiture of performance based award | shares						10,000
Performance Based Restricted Stock Units [Member] | January 2022 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $						$ 2,000,000			$ 3,900,000
Number of milestones achieved | Milestone						3			3	3	3
Number of milestones deemed as achievable | Milestone						1			1	1	1
Forfeiture of performance based award | shares						0
Performance Based Restricted Stock Units [Member] | January 2023 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation | $						$ 5,000,000
Number of milestones deemed as achievable | Milestone						4			4	4	4
Forfeiture of performance based award | shares						0
2014 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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. 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%
Common stock reserved for future issuance | shares													1,527,770
Additional number of shares of common stock reserved for issuance | shares						15,407,065			15,407,065	15,407,065	15,407,065
2014 ESPP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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%
Common stock reserved for future issuance | shares													458,331
Additional number of shares of common stock reserved for issuance | shares						4,402,017			4,402,017	4,402,017	4,402,017
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%