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Summary of Significant Accounting Policies - (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Schedule of Concentration of Risk, by Risk Factor and Significant Payer

For each significant payor and customer, revenue as a percentage of total revenue and accounts receivable as a percentage of total accounts receivable are as follows:

 

						Revenue
						Three Months Ended September 30,												Nine Months Ended September 30,
						2021						2020						2021						2020
Medicare						19		%				20		%				19		%				21		%
Medicare Advantage						13		%				11		%				13		%				11		%
Blue Shield						12		%				12		%				12		%				12		%
Janssen (SIMPONI®)						*						13		%				*						12		%

* Less than 10%.

												Accounts Receivable
												September 30, 2021						December 31, 2020
Blue Shield															17		%							11		%
United Healthcare												16		%				*
Janssen (SIMPONI®)												11		%				35		%

* Less than 10%.

Disaggregation of Revenue

The following table includes the Company's revenues as disaggregated by payor and customer category (in thousands):

 

						Three Months Ended September 30,												Nine Months Ended September 30,
						2021						2020						2021						2020
Revenue:
Healthcare insurers						$	6,910					$	5,749					$	20,318					$	15,949
Government						2,330						2,184						6,733						6,236
Client(1)						2,346						1,260						6,738						3,088
Other(2)						265						235						821						636
Janssen (SIMPONI®)						400						1,347						1,000						3,398
Total revenue						$	12,251					$	10,775					$	35,610					$	29,307

(1)Includes hospitals, other laboratories, etc.

(2)Includes patient self-pay.

Schedule of Restricted Cash and Cash Equivalents

Cash, cash equivalents and restricted cash presented in the accompanying condensed statements of cash flows consist of the following (in thousands): 

												September 30, 2021						December 31, 2020
Cash and cash equivalents															$	106,766								$	57,448
Restricted cash												100						100
												$	106,866					$	57,548

Schedule of Cash and Cash Equivalents

Cash, cash equivalents and restricted cash presented in the accompanying condensed statements of cash flows consist of the following (in thousands): 

												September 30, 2021						December 31, 2020
Cash and cash equivalents															$	106,766								$	57,448
Restricted cash												100						100
												$	106,866					$	57,548

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

Potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive are as follows (in common stock equivalent shares):

 

						Three Months Ended September 30,												Nine Months Ended September 30,
						2021						2020						2021						2020
Warrants to purchase common stock						409,108						426,827						409,108						426,827
Common stock options						2,067,057						1,975,250						2,067,057						1,975,250
Restricted stock units						403,100						—						403,100						—
Employee stock purchase plan						4,130						3,144						4,130						3,144
Total						2,883,395						2,405,221						2,883,395						2,405,221

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