Revenue Recognition - Accounts Receivable and Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Assets
Accounts receivable	$ 62,974	$ 62,223
Liabilities:
Deferred revenue, current portion	19,154	4,131
Deferred revenue, long-term portion	60,527	40,058
Total deferred revenues	79,681	44,189
Current accounts receivable	62,974	62,223
Other noncurrent assets	$ 13,091	$ 3,317
Evercord | Processing and storage services | Alternate
Liabilities:
Billing collection period (in months)	12 months
Evercord | Processing and storage services | Minimum
Liabilities:
Billing collection period (in months)	6 months
Evercord | Processing and storage services | Maximum
Liabilities:
Billing collection period (in months)	18 months
Evercord | Storage services
Liabilities:
Prepayment plan, delivery duration (in years)	18 years
Accounts receivable	$ 4,400
Other noncurrent assets	$ 300
Evercord | Storage services | Alternate
Liabilities:
Prepayment plan, financing duration (in months)	12 months
Evercord | Storage services | Minimum
Liabilities:
Prepayment plan, financing duration (in months)	6 months
Evercord | Storage services | Maximum
Liabilities:
Prepayment plan, financing duration (in months)	18 months
BGI
Liabilities:
Deferred revenue, current portion	$ 15,000
Deferred revenue, long-term portion	19,982
Total deferred revenues	$ 34,982