Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 12,028	$ 34,950
Property and equipment held for sale	386
Accounts receivable	1,139	823
Prepaid retention payments	1,069
Prepaid expenses and other current assets	987	1,017
Total current assets	15,609	36,790
Property and equipment, net	114	668
Other assets	230	230
Total	15,953	37,688
Current liabilities:
Current portion of loan payable		8,382
Accounts payable	644	1,446
Accrued expenses	3,538	4,611
Current portion deferred revenue	2,500	2,500
Total current liabilities	6,682	16,939
Long-term liabilities:
Loan payable, net of current portion		4,439
Deferred revenue	1,368	1,993
Other long-term liabilities	162	1,206
Total long-term liabilities	1,530	7,638
Commitments and contingencies
Stockholders' equity:
Preferred stock $0.01 par value; 5,000,000 shares authorized, no shares issued or outstanding
Common stock, $0.0001 par value; 120,000,000 shares authorized, 29,021,455 and 28,937,185 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	3	3
Additional paid-in capital	214,757	213,788
Accumulated deficit	(207,019)	(200,680)
Total stockholders' equity	7,741	13,111
Total	$ 15,953	$ 37,688

Prepaid retention payments.

No definition available.

Name:	ceru_PrepaidRetentionPayments
Namespace Prefix:	ceru_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).