Fair Value Measurements and Marketable Securities - Summary of Financial Assets and Liabilities Measured at Fair Value Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cash equivalents:
Total cash equivalents	$ 3,400	$ 2,700
Fair Value, Measurements, Recurring [Member]
Cash equivalents:
Total cash equivalents	73,598	82,492
Marketable securities:
Total marketable securities	38,634	41,697
Total cash equivalents and marketable securities	112,232	124,189
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Cash equivalents:
Total cash equivalents	73,598	82,492
Marketable securities:
Total marketable securities	38,634	41,697
Total cash equivalents and marketable securities	112,232	124,189
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Cash equivalents:
Total cash equivalents	73,598	73,488
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member] | Level 2 [Member]
Cash equivalents:
Total cash equivalents	73,598	73,488
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Cash equivalents:
Total cash equivalents		5,998
Marketable securities:
Total marketable securities	28,487	28,476
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member] | Level 2 [Member]
Cash equivalents:
Total cash equivalents		5,998
Marketable securities:
Total marketable securities	28,487	28,476
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Cash equivalents:
Total cash equivalents		3,006
Marketable securities:
Total marketable securities	10,147	13,221
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member] | Level 2 [Member]
Cash equivalents:
Total cash equivalents		3,006
Marketable securities:
Total marketable securities	$ 10,147	$ 13,221