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Summary of Significant Accounting Policies - (Tables)

6 Months Ended

Jun. 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 June 30,												Six Months Ended June 30,
						2021						2020						2021						2020
Medicare						19		%				18		%				19		%				22		%
Medicare Advantage						13		%				*						12		%				11		%
Blue Shield						11		%				11		%				11		%				12		%
Janssen (SIMPONI®)						*						23		%				*						11		%

* Less than 10%.

												Accounts Receivable
												June 30, 2021						December 31, 2020
Blue Shield															16		%							11		%
United Healthcare												13		%				*
Janssen (SIMPONI®)												*						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 June 30,												Six Months Ended June 30,
						2021						2020						2021						2020
Revenue:
Healthcare insurers						$	7,381					$	4,138					$	13,408					$	10,200
Government						2,394						1,807						4,403						4,052
Client(1)						2,427						746						4,392						1,828
Other(2)						270						206						556						401
Janssen (SIMPONI®)						300						2,051						600						2,051
Total revenue						$	12,772					$	8,948					$	23,359					$	18,532

(1)Includes hospitals, other laboratories, etc.

(2)Includes patient self-pay that is immaterial.

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): 

												June 30, 2021						December 31, 2020
Cash and cash equivalents															$	112,576								$	57,448
Restricted cash												100						100
												$	112,676					$	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): 

												June 30, 2021						December 31, 2020
Cash and cash equivalents															$	112,576								$	57,448
Restricted cash												100						100
												$	112,676					$	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 June 30,												Six Months Ended June 30,
						2021						2020						2021						2020
Warrants to purchase common stock						426,827						426,827						426,827						426,827
Common stock options						2,123,617						1,677,000						2,123,617						1,677,000
Restricted stock units						375,525						—						375,525						—
Employee stock purchase plan						12,525						10,259						12,525						10,259
Total						2,938,494						2,114,086						2,938,494						2,114,086

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