Organization and Summary of Significant Accounting Policies - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disaggregation of Revenue [Line Items]
Gross profit	$ 372,330	$ 318,637	$ 317,085
Selling, general, and administrative	263,095	241,470	237,881
Provision for (benefit from) income taxes	(2,113)	(26,006)	3,220
Net income	$ 37,729	$ 30,518	$ 9,756
Basic (in dollars per share)	$ 0.96	$ 0.81	$ 0.27
Diluted (in dollars per share)	$ 0.93	$ 0.79	$ 0.26
Accounts receivable and unbilled receivables, net	$ 196,238	$ 190,046
Prepaid expenses	20,700	20,392
Prepaid commissions		41,432
Other long-term assets	74,613	49,316
Deferred revenues, net	81,835	78,774
Long-term deferred revenues	10,582	10,623
Long-term deferred tax liabilities	41,484	41,446
Stockholders’ equity	679,617	554,341	$ 458,836	$ 420,464
Automation and Analytics
Disaggregation of Revenue [Line Items]
Gross profit		278,498	285,944
Medication Adherence
Disaggregation of Revenue [Line Items]
Gross profit		40,139	31,141
As Reported
Disaggregation of Revenue [Line Items]
Selling, general, and administrative		250,312	249,520
Provision for (benefit from) income taxes		(21,484)	(2,551)
Net income		$ 20,605	$ 603
Basic (in dollars per share)		$ 0.55	$ 0.02
Diluted (in dollars per share)		$ 0.53	$ 0.02
Accounts receivable and unbilled receivables, net		$ 189,227
Prepaid expenses		36,060
Prepaid commissions		0
Other long-term assets		39,841
Deferred revenues, net		86,104
Long-term deferred revenues		17,244
Long-term deferred tax liabilities		28,579
Stockholders’ equity		517,199
As Reported | Automation and Analytics
Disaggregation of Revenue [Line Items]
Revenues		590,392	$ 593,626
Gross profit		281,949	282,659
As Reported | Medication Adherence
Disaggregation of Revenue [Line Items]
Revenues		125,773	98,997
Gross profit		40,139	31,141
Adjustment
Disaggregation of Revenue [Line Items]
Net income	$ 2,500
Accounting Standards Update 2014-09 | Adjustment
Disaggregation of Revenue [Line Items]
Selling, general, and administrative		(8,842)	(11,639)
Provision for (benefit from) income taxes		(4,522)	5,771
Net income		$ 9,913	$ 9,153
Basic (in dollars per share)		$ 0.26	$ 0.25
Diluted (in dollars per share)		$ 0.26	$ 0.24
Accounts receivable and unbilled receivables, net		$ 819
Prepaid expenses		(15,668)
Prepaid commissions		41,432
Other long-term assets		9,475
Deferred revenues, net		(7,330)
Long-term deferred revenues		(6,621)
Long-term deferred tax liabilities		12,867
Stockholders’ equity		37,142
Accounting Standards Update 2014-09 | Adjustment | Automation and Analytics
Disaggregation of Revenue [Line Items]
Revenues		(3,451)	$ 3,285
Gross profit		(3,451)	3,285
Accounting Standards Update 2014-09 | Adjustment | Medication Adherence
Disaggregation of Revenue [Line Items]
Revenues		0	0
Gross profit		$ 0	$ 0