Organization and Summary of Significant Accounting Policies (Other) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) Test country	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Revenue Recognition
Minimum number of Oncotype tests by exclusive distribution agreements | Test			1
Minimum number of countries covered for distribution agreements establishment | country			90
Accrued refunds	$ 216,000		$ 216,000		$ 487,000
Allowance for Doubtful Accounts
Allowance for doubtful accounts	3,106,000		3,106,000		$ 4,508,000
Write-offs for doubtful accounts recorded against allowance	1,700,000	$ 1,800,000	3,000,000	$ 4,200,000
Bad debt expense	$ 1,200,000	$ 2,200,000	$ 1,600,000	$ 4,500,000