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STOCK INCENTIVE PLANS (Tables)
 6 Months Ended
Jun. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Summary of Options, RSUs Activity under 2014 Equity Incentive Plan and 2016 Inducement Plan and Related Information
The following table summarizes option and RSU activity under the Company’s 2014 Equity Incentive Plan, 2016 Inducement Equity Incentive Plan, 2019 Inducement Equity Incentive Plan and 2024 Equity Incentive Plan, and related information:
Shares
Available
for Grant		Stock
Options
Outstanding		Weighted-
Average
Exercise
Price		Number of
RSU Shares		Weighted-
Average
Grant Date
Fair Value
Balance—December 31, 2023869,111 3,055,208 $25.21 5,006,775 $19.02 
Additional shares authorized6,748,645 — — — — 
Common stock awards for services(11,748)— — — — 
RSUs granted(3,360,339)— — 3,360,339 9.32 
RSUs vested— — — (1,456,490)18.14 
Options granted(854,898)854,898 9.29 — — 
Options exercised— (20,037)6.54 — — 
Repurchase of common stock under employee incentive plans391,535 — — — — 
RSUs forfeited247,195 — — (247,195)17.32 
Options forfeited21,809 (21,809)27.94 — — 
Options expired85,247 (85,247)30.19 — — 
Balance—June 30, 20244,136,557 3,783,013 $21.58 6,663,429 $14.54 
Summary of Options Outstanding and Exercisable Vested or Expected to Vest
Options outstanding that have vested and are expected to vest at June 30, 2024 are as follows:
Number of Shares Issued
(In thousands)		Weighted-Average
Exercise Price		Weighted-Average Remaining Contractual Life (Years)Aggregate Intrinsic Value
(In thousands)
Vested2,122 $25.06 6.34$3,836 
Expected to vest1,474 17.53 8.074,376 
Total3,596 $8,212 
Summary of Weighted-Average Assumptions Used to Estimate Fair Values of Share-Based Awards
The estimated fair values of employee stock options and ESPP shares were estimated using the Black-Scholes option pricing model based on the following weighted average assumptions:
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Employee stock options
Expected term (in years)5.85.05.85.6
Expected volatility76.52%76.63%76.52%77.86%
Risk-free interest rate4.57%3.99%4.57%3.67%
Expected dividend yield—%—%—%—%
Employee stock purchase plan
Expected term (in years)0.50.50.50.5
Expected volatility91.99%93.38%91.99%93.38%
Risk-free interest rate5.24%5.47%5.24%5.47%
Expected dividend yield—%—%—%—%
Summary of Expense Relating to Employee and Nonemployee Stock-Based Payment Awards from Stock Options and RSUs
The following table summarizes stock-based compensation expense relating to employee and non-employee stock-based awards for the three and six months ended June 30, 2024 and 2023, included in the condensed consolidated statements of operations as follows (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Cost of testing services$357 $492 $814 $971 
Cost of product225 274 542 634 
Cost of patient and digital solutions350 367 722 769 
Research and development1,628 1,704 3,388 3,666 
Sales and marketing2,927 2,779 5,971 6,516 
General and administrative7,683 7,084 15,077 13,898 
Total$13,170 $12,700 $26,514 $26,454