function searchRight( x, p, lambda ) {
	while ( true ) {
		x += 1;
		if ( cdf( x, lambda ) >= p ) {
			return x;
		}
	}
}
Performs a search to the right.

@private
@param {NonNegativeInteger} x - starting guess
@param {Probability} p - probability
@param {NonNegativeNumber} lambda - mean parameter
@returns {NonNegativeInteger} `p` quantile of the specified distribution