Fair Value Measurements - Contingent consideration (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				12 Months Ended
	Jan. 07, 2014	Mar. 31, 2016	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in fair value
Reduction in fair value of acquisition-related contingent consideration expense						$ 338	$ 2,059	$ (790)
St. Mary Prescription Pharmacy
Change in fair value
Payments of acquisition-related consideration				$ 300	$ 500		$ 300
Equity consideration (in shares)	54,124	10,824		16,237	27,062		16,237
Acquisition-related contingent consideration outstanding						0	$ 0
Fair value of equity consideration		$ 35		$ 94	$ 96		$ 94
Exercise price (in dollars per share)							$ 5.82
Reduction in fair value of acquisition-related contingent consideration expense		$ 15
Capstone
Change in fair value
Payments of acquisition-related consideration			$ 577				$ 577
Equity consideration (in shares)			18,418				18,418
Acquisition-related contingent consideration outstanding						0	$ 0
Fair value of equity consideration			$ 107				$ 107
Exercise price (in dollars per share)							$ 5.82
Medliance
Change in fair value
Payments of acquisition-related consideration							$ 1,895
Acquisition-related contingent consideration outstanding						3,008	5,241
Reduction in fair value of acquisition-related contingent consideration expense						$ 338	$ 2,059