Fair Value Measurements - Summary Of Investments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 29,005	$ 5,335
Gross unrealized gains in Accumulated OCI	2,184	6,725
Gross unrealized losses in Accumulated OCI	(202)	0
Gain/(Loss) in Accumulated Deficit	468	88
Fair value	31,455	12,148
Common Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,376	2,051
Gross unrealized gains in Accumulated OCI	1,417	6,185
Gross unrealized losses in Accumulated OCI	0	0
Gain/(Loss) in Accumulated Deficit
Fair value	2,793	8,236
BZNE Note and conversion feature [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,700	1,700
Gross unrealized gains in Accumulated OCI	53	53
Gross unrealized losses in Accumulated OCI	0	0
Gain/(Loss) in Accumulated Deficit	287	287
Fair value	2,040	2,040
Neovasc common stock options [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	925	925
Gross unrealized gains in Accumulated OCI	714	293
Gross unrealized losses in Accumulated OCI	(202)	0
Gain/(Loss) in Accumulated Deficit	181	176
Fair value	1,618	1,394
Neovasc common stock warrants [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		659
Gross unrealized gains in Accumulated OCI		194
Gross unrealized losses in Accumulated OCI		0
Gain/(Loss) in Accumulated Deficit		(375)
Fair value		478
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	25,004
Gross unrealized gains in Accumulated OCI	0
Gross unrealized losses in Accumulated OCI
Gain/(Loss) in Accumulated Deficit	0
Fair value	$ 25,004