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Balance Sheet Details (Tables)

9 Months Ended

Sep. 30, 2023

Balance Sheet Details

Schedule of short-term investments

Short-term investments consisted of the following (in thousands):

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

At September 30, 2023

​

​

Maturity

​

Amortized cost

​

Unrealized

​

Unrealized

​

Estimated

​

(in years)

or cost

gains

losses

fair value

U.S. government agency bonds

​

less than 3

​

$

47,989

​

$

-

​

​

(658)

​

$

47,331

​

U.S. treasury securities

​

less than 2

​

​

95,929

​

​

-

​

​

(320)

​

​

95,609

​

Bank certificates of deposit

​

less than 2

​

​

11,300

​

​

1

​

​

(1)

​

​

11,300

​

Corporate notes

​

less than 3

​

22,104

​

11

​

(403)

​

21,712

​

Asset-backed securities

​

less than 2

​

8,613

​

-

​

(226)

​

8,387

​

Municipal bonds

​

less than 3

​

​

7,634

​

​

-

​

​

(45)

​

​

7,589

​

Total

​

​

​

$

193,569

​

$

12

​

$

(1,653)

​

$

191,928

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

At December 31, 2022

​

​

Maturity

​

Amortized cost

​

Unrealized

​

Unrealized

​

Estimated

​

(in years)

or cost

gains

losses

fair value

U.S. government agency bonds

​

less than 3

​

$

88,478

​

$

-

​

$

(2,413)

​

$

86,065

​

U.S. treasury securities

​

less than 1

​

​

52,991

​

​

-

​

​

(384)

​

​

52,607

​

Bank certificates of deposit

​

less than 1

​

​

17,500

​

​

3

​

​

(11)

​

​

17,492

​

Corporate notes

​

less than 3

​

41,464

​

-

​

(978)

​

40,486

​

Asset-backed securities

​

less than 2

​

21,656

​

-

​

(360)

​

21,296

​

Municipal bonds

​

less than 3

​

​

15,635

​

​

-

​

​

(411)

​

​

15,224

​

Total

​

​

​

$

237,724

​

$

3

​

$

(4,557)

​

$

233,170

​

Schedule of accounts receivable, net

Accounts receivable consisted of the following (in thousands):

​	​	​	​	​	​	​	​
​	​	September 30,		​	December 31,		​
​		2023			2022
Accounts receivable	​	$	40,510	​	$	37,323	​
Allowance for credit losses	​	​	(1,184)	​	​	(1,250)	​
​	​	$	39,326	​	$	36,073	​

Schedule of inventory

Inventory consisted of the following (in thousands):

​	​	​	​	​	​	​	​
​	​	September 30,		​	December 31,		​
​		2023			2022
Finished goods	​	$	16,674	​	$	13,742	​
Work in process	​	​	11,470	​	​	10,495	​
Raw material	​	​	11,637	​	​	13,604	​
​	​	$	39,781	​	$	37,841	​

Schedule of accrued liabilities

Accrued liabilities consisted of the following (in thousands):

​	​	​	​	​	​	​
​	​	September 30,		​	December 31,
​		2023			2022
Accrued bonuses	​	$	13,661	​	$	17,219
Accrued vacation benefits	​	​	5,032	​	​	4,475
Other accrued liabilities	​	​	38,041	​	​	36,262
​	​	$	56,734	​	$	57,956

​

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