Long-Term Debt (Details 3) (Construction in progress, lease, USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2013
Construction in progress, lease
Financing Obligation
Amount of construction-in-progress recorded during period	$ 1.9
Amount of obligations related to construction-in-progress recorded during period	$ 1.9

Amount of financing obligation incurred during the period in connection with construction in progress on a build to suit lease arrangement, net amortization applied to principal through the balance sheet date.

No definition available.

Name:	vphm_FinancingObligationIncurred
Namespace Prefix:	vphm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration